Has any object launched from Earth gone into the Sun?What is the delta-v required to get a mass in Earth...
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Has any object launched from Earth gone into the Sun?
What is the delta-v required to get a mass in Earth orbit into the sun using a SINGLE transfer?Have any spacecraft been launched or proposed to make a survivable close encounter with the Sun?Is there any wavelength at which the Sun is both transparent to and quiet of electromagnetic radiation?What time of events is given for probes a long way away from Earth?Has any probe ever been launched into a highly elliptical orbit with say 20-30 year to orbit the sun?Why not leave interplanetary probes on standby after primary mission, activating them at will decades later?What's the furthest a probe has travelled from Earth before returning?How are precision trajectory measurements made of trans-Neptunian spacecraft?Has Juno now gone faster than - and braked harder than - any other human-made object ever?What thermal effect does the Sun have on spacecraft that are roughly the same distance from the sun as the earth is?Which spacecraft will be the first for which the Sun would become the second brightest object in the sky?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}
$begingroup$
I've seen a lot of questions about the $Delta V$ required to reach the Sun from the Earth (~22-30 km/s if I remember correctly), firing a bullet into the sun, etc.
But has this ever happened? Has any object launched into space from Earth deliberately or accidentally gone into the sun and never come out? I.e. being engulfed by a solar flare and surviving doesn't count. The expectation is that the object would keep falling deeper into the sun until it disintegrated.
probe the-sun uncrewed-spaceflight
edited 3 hours ago
peterh
2,1313 gold badges17 silver badges35 bronze badges
asked 18 hours ago
CJ DennisCJ Dennis
2742 silver badges8 bronze badges
$endgroup$
|
show 8 more comments
$begingroup$
I've seen a lot of questions about the $Delta V$ required to reach the Sun from the Earth (~22-30 km/s if I remember correctly), firing a bullet into the sun, etc.
But has this ever happened? Has any object launched into space from Earth deliberately or accidentally gone into the sun and never come out? I.e. being engulfed by a solar flare and surviving doesn't count. The expectation is that the object would keep falling deeper into the sun until it disintegrated.
probe the-sun uncrewed-spaceflight
edited 3 hours ago
peterh
2,1313 gold badges17 silver badges35 bronze badges
asked 18 hours ago
CJ DennisCJ Dennis
2742 silver badges8 bronze badges
$endgroup$
5
$begingroup$
"Has any object launched into space from Earth ... gone into the sun and never come out?" Could anything (except photons) go into the Sun and then come out?
$endgroup$
– RonJohn
7 hours ago
$begingroup$
@Ron - I kind of thought the same thing... How does something return from the sun? It has to be a one-way trip. For example, some of the debris from space junk and some of the debris from the Chinese blowing up that satellite have surely made it to the sun due to gravitational forces. How does the debris come back out?
$endgroup$
– jww
5 hours ago
$begingroup$
@RonJohn I've submitted an edit to remove the word "permanently" from the title, since it accomplishes nothing but confusing people who read it.
$endgroup$
– Monty Harder
4 hours ago
$begingroup$
Afaik it is $approx 41$ km/s. 13km/s to leave the Earth, 28 km/s to neutralize its orbital speed around the Sun. It is absolutely impossible with the todays technology. A very complex trajectory, like the Parker Solar Probe, using many gravitational slingshots, could get into the Sun in $approx$ a decade.
$endgroup$
– peterh
3 hours ago
1
$begingroup$
@RonJohn : If our coordinate system is anchored to the center of mass of the Sun, then other things fall into the Sun (since the Sun is always stationary in that coordinate system). TDB is an atomic timekeeping system that is based on a hypothetical atomic clock sitting at the CoM of the Solar system (which I usually don't bother to distinguish from the Sun's CoM since the distance between them is usually $leq$ a few hundred kilometers and the difference in redshifts between the two is small).
$endgroup$
– Eric Towers
1 hour ago
|
show 8 more comments
$begingroup$
I've seen a lot of questions about the $Delta V$ required to reach the Sun from the Earth (~22-30 km/s if I remember correctly), firing a bullet into the sun, etc.
But has this ever happened? Has any object launched into space from Earth deliberately or accidentally gone into the sun and never come out? I.e. being engulfed by a solar flare and surviving doesn't count. The expectation is that the object would keep falling deeper into the sun until it disintegrated.
probe the-sun uncrewed-spaceflight
edited 3 hours ago
peterh
2,1313 gold badges17 silver badges35 bronze badges
asked 18 hours ago
CJ DennisCJ Dennis
2742 silver badges8 bronze badges
$endgroup$
I've seen a lot of questions about the $Delta V$ required to reach the Sun from the Earth (~22-30 km/s if I remember correctly), firing a bullet into the sun, etc.
But has this ever happened? Has any object launched into space from Earth deliberately or accidentally gone into the sun and never come out? I.e. being engulfed by a solar flare and surviving doesn't count. The expectation is that the object would keep falling deeper into the sun until it disintegrated.
probe the-sun uncrewed-spaceflight
probe the-sun uncrewed-spaceflight
edited 3 hours ago
peterh
2,1313 gold badges17 silver badges35 bronze badges
asked 18 hours ago
CJ DennisCJ Dennis
2742 silver badges8 bronze badges
edited 3 hours ago
peterh
2,1313 gold badges17 silver badges35 bronze badges
asked 18 hours ago
CJ DennisCJ Dennis
2742 silver badges8 bronze badges
edited 3 hours ago
peterh
2,1313 gold badges17 silver badges35 bronze badges
edited 3 hours ago
peterh
2,1313 gold badges17 silver badges35 bronze badges
edited 3 hours ago
peterh
2,1313 gold badges17 silver badges35 bronze badges
2,1313 gold badges17 silver badges35 bronze badges
asked 18 hours ago
CJ DennisCJ Dennis
2742 silver badges8 bronze badges
asked 18 hours ago
CJ DennisCJ Dennis
2742 silver badges8 bronze badges
asked 18 hours ago
CJ DennisCJ Dennis
2742 silver badges8 bronze badges
2742 silver badges8 bronze badges
5
$begingroup$
"Has any object launched into space from Earth ... gone into the sun and never come out?" Could anything (except photons) go into the Sun and then come out?
$endgroup$
– RonJohn
7 hours ago
$begingroup$
@Ron - I kind of thought the same thing... How does something return from the sun? It has to be a one-way trip. For example, some of the debris from space junk and some of the debris from the Chinese blowing up that satellite have surely made it to the sun due to gravitational forces. How does the debris come back out?
$endgroup$
– jww
5 hours ago
$begingroup$
@RonJohn I've submitted an edit to remove the word "permanently" from the title, since it accomplishes nothing but confusing people who read it.
$endgroup$
– Monty Harder
4 hours ago
$begingroup$
Afaik it is $approx 41$ km/s. 13km/s to leave the Earth, 28 km/s to neutralize its orbital speed around the Sun. It is absolutely impossible with the todays technology. A very complex trajectory, like the Parker Solar Probe, using many gravitational slingshots, could get into the Sun in $approx$ a decade.
$endgroup$
– peterh
3 hours ago
1
$begingroup$
@RonJohn : If our coordinate system is anchored to the center of mass of the Sun, then other things fall into the Sun (since the Sun is always stationary in that coordinate system). TDB is an atomic timekeeping system that is based on a hypothetical atomic clock sitting at the CoM of the Solar system (which I usually don't bother to distinguish from the Sun's CoM since the distance between them is usually $leq$ a few hundred kilometers and the difference in redshifts between the two is small).
$endgroup$
– Eric Towers
1 hour ago
|
show 8 more comments
5
$begingroup$
"Has any object launched into space from Earth ... gone into the sun and never come out?" Could anything (except photons) go into the Sun and then come out?
$endgroup$
– RonJohn
7 hours ago
$begingroup$
@Ron - I kind of thought the same thing... How does something return from the sun? It has to be a one-way trip. For example, some of the debris from space junk and some of the debris from the Chinese blowing up that satellite have surely made it to the sun due to gravitational forces. How does the debris come back out?
$endgroup$
– jww
5 hours ago
$begingroup$
@RonJohn I've submitted an edit to remove the word "permanently" from the title, since it accomplishes nothing but confusing people who read it.
$endgroup$
– Monty Harder
4 hours ago
$begingroup$
Afaik it is $approx 41$ km/s. 13km/s to leave the Earth, 28 km/s to neutralize its orbital speed around the Sun. It is absolutely impossible with the todays technology. A very complex trajectory, like the Parker Solar Probe, using many gravitational slingshots, could get into the Sun in $approx$ a decade.
$endgroup$
– peterh
3 hours ago
1
$begingroup$
@RonJohn : If our coordinate system is anchored to the center of mass of the Sun, then other things fall into the Sun (since the Sun is always stationary in that coordinate system). TDB is an atomic timekeeping system that is based on a hypothetical atomic clock sitting at the CoM of the Solar system (which I usually don't bother to distinguish from the Sun's CoM since the distance between them is usually $leq$ a few hundred kilometers and the difference in redshifts between the two is small).
$endgroup$
– Eric Towers
1 hour ago
5
5
$begingroup$
"Has any object launched into space from Earth ... gone into the sun and never come out?" Could anything (except photons) go into the Sun and then come out?
$endgroup$
– RonJohn
7 hours ago
$begingroup$
"Has any object launched into space from Earth ... gone into the sun and never come out?" Could anything (except photons) go into the Sun and then come out?
$endgroup$
– RonJohn
7 hours ago
$begingroup$
@Ron - I kind of thought the same thing... How does something return from the sun? It has to be a one-way trip. For example, some of the debris from space junk and some of the debris from the Chinese blowing up that satellite have surely made it to the sun due to gravitational forces. How does the debris come back out?
$endgroup$
– jww
5 hours ago
$begingroup$
@Ron - I kind of thought the same thing... How does something return from the sun? It has to be a one-way trip. For example, some of the debris from space junk and some of the debris from the Chinese blowing up that satellite have surely made it to the sun due to gravitational forces. How does the debris come back out?
$endgroup$
– jww
5 hours ago
$begingroup$
@RonJohn I've submitted an edit to remove the word "permanently" from the title, since it accomplishes nothing but confusing people who read it.
$endgroup$
– Monty Harder
4 hours ago
$begingroup$
@RonJohn I've submitted an edit to remove the word "permanently" from the title, since it accomplishes nothing but confusing people who read it.
$endgroup$
– Monty Harder
4 hours ago
$begingroup$
Afaik it is $approx 41$ km/s. 13km/s to leave the Earth, 28 km/s to neutralize its orbital speed around the Sun. It is absolutely impossible with the todays technology. A very complex trajectory, like the Parker Solar Probe, using many gravitational slingshots, could get into the Sun in $approx$ a decade.
$endgroup$
– peterh
3 hours ago
$begingroup$
Afaik it is $approx 41$ km/s. 13km/s to leave the Earth, 28 km/s to neutralize its orbital speed around the Sun. It is absolutely impossible with the todays technology. A very complex trajectory, like the Parker Solar Probe, using many gravitational slingshots, could get into the Sun in $approx$ a decade.
$endgroup$
– peterh
3 hours ago
1
1
$begingroup$
@RonJohn : If our coordinate system is anchored to the center of mass of the Sun, then other things fall into the Sun (since the Sun is always stationary in that coordinate system). TDB is an atomic timekeeping system that is based on a hypothetical atomic clock sitting at the CoM of the Solar system (which I usually don't bother to distinguish from the Sun's CoM since the distance between them is usually $leq$ a few hundred kilometers and the difference in redshifts between the two is small).
$endgroup$
– Eric Towers
1 hour ago
$begingroup$
@RonJohn : If our coordinate system is anchored to the center of mass of the Sun, then other things fall into the Sun (since the Sun is always stationary in that coordinate system). TDB is an atomic timekeeping system that is based on a hypothetical atomic clock sitting at the CoM of the Solar system (which I usually don't bother to distinguish from the Sun's CoM since the distance between them is usually $leq$ a few hundred kilometers and the difference in redshifts between the two is small).
$endgroup$
– Eric Towers
1 hour ago
|
show 8 more comments
1 Answer
1
active
oldest
votes
$begingroup$
No, not yet. The Parker Solar Probe became the closest ever artificial object to the sun on October 29th, 2018, surpassing Helios 2 which held the record since 1975 [1].
No other human-made object has been closer to the Sun. The probe will repeatedly touch the outer corona until mission end in 2025, with the closest approach being 3.83 million miles [2]. It will then lose altitude control and parts of it will likely fall into the sun in subsequent years [3].
The spacecraft reached the low perihelion by repeated gravity assists from Venus.
References:
- https://en.wikipedia.org/wiki/Parker_Solar_Probe
- http://parkersolarprobe.jhuapl.edu/The-Mission/index.php
- https://www.telegraph.co.uk/science/2018/08/09/nasa-probe-will-still-circling-sun-end-solar-system-say-scientists/
answered 17 hours ago
PolygnomePolygnome
4,08718 silver badges33 bronze badges
$endgroup$
1
$begingroup$
"It will then lose altitude (sic) control..." needs a source, there might be a possible mission extension unless you're sure that that's scheduled and inevitable.
$endgroup$
– uhoh
17 hours ago
1
$begingroup$
@uhoh I've included a link to an interview with the program manager of the parker solar probe as reference for that.
$endgroup$
– Polygnome
17 hours ago
4
$begingroup$
I'm pretty sure "altitude" should be "attitude" in that article.
$endgroup$
– JohannesD
9 hours ago
3
$begingroup$
Once it runs out of propellant and/or its reaction wheels fail loss of attitude control is inevitable. Components hiding behind the sun shield will get slagged down when exposed to direct solar radiation; but anything burned off I'd expect to be blown away in the solar wind. To fall into the sun, drag during its passes through the Corona would need to be sufficient to de-orbit the remnant. Is drag actually strong enough to accomplish that it was the interviewee speaking figuratively?
$endgroup$
– Dan Neely
7 hours ago
1
$begingroup$
@DanNeely I think drag is not enough for that. It will be still $approx$ 3 solar diameter away, and the solar atmospheric density decreases exponentially. After the loss of attitude control, the probe will quickly die, later starts to rotate. Probably its tungsten shield will last the longest, it is hard to calculate, when will it fully evaporate. Possible, that it is will survive until billions of years (note, it will heat only until $approx$ 2000C, and tungsten melts at 3400C).
$endgroup$
– peterh
3 hours ago
add a comment |
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1 Answer
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$begingroup$
No, not yet. The Parker Solar Probe became the closest ever artificial object to the sun on October 29th, 2018, surpassing Helios 2 which held the record since 1975 [1].
No other human-made object has been closer to the Sun. The probe will repeatedly touch the outer corona until mission end in 2025, with the closest approach being 3.83 million miles [2]. It will then lose altitude control and parts of it will likely fall into the sun in subsequent years [3].
The spacecraft reached the low perihelion by repeated gravity assists from Venus.
References:
- https://en.wikipedia.org/wiki/Parker_Solar_Probe
- http://parkersolarprobe.jhuapl.edu/The-Mission/index.php
- https://www.telegraph.co.uk/science/2018/08/09/nasa-probe-will-still-circling-sun-end-solar-system-say-scientists/
answered 17 hours ago
PolygnomePolygnome
4,08718 silver badges33 bronze badges
$endgroup$
1
$begingroup$
"It will then lose altitude (sic) control..." needs a source, there might be a possible mission extension unless you're sure that that's scheduled and inevitable.
$endgroup$
– uhoh
17 hours ago
1
$begingroup$
@uhoh I've included a link to an interview with the program manager of the parker solar probe as reference for that.
$endgroup$
– Polygnome
17 hours ago
4
$begingroup$
I'm pretty sure "altitude" should be "attitude" in that article.
$endgroup$
– JohannesD
9 hours ago
3
$begingroup$
Once it runs out of propellant and/or its reaction wheels fail loss of attitude control is inevitable. Components hiding behind the sun shield will get slagged down when exposed to direct solar radiation; but anything burned off I'd expect to be blown away in the solar wind. To fall into the sun, drag during its passes through the Corona would need to be sufficient to de-orbit the remnant. Is drag actually strong enough to accomplish that it was the interviewee speaking figuratively?
$endgroup$
– Dan Neely
7 hours ago
1
$begingroup$
@DanNeely I think drag is not enough for that. It will be still $approx$ 3 solar diameter away, and the solar atmospheric density decreases exponentially. After the loss of attitude control, the probe will quickly die, later starts to rotate. Probably its tungsten shield will last the longest, it is hard to calculate, when will it fully evaporate. Possible, that it is will survive until billions of years (note, it will heat only until $approx$ 2000C, and tungsten melts at 3400C).
$endgroup$
– peterh
3 hours ago
add a comment |
$begingroup$
No, not yet. The Parker Solar Probe became the closest ever artificial object to the sun on October 29th, 2018, surpassing Helios 2 which held the record since 1975 [1].
No other human-made object has been closer to the Sun. The probe will repeatedly touch the outer corona until mission end in 2025, with the closest approach being 3.83 million miles [2]. It will then lose altitude control and parts of it will likely fall into the sun in subsequent years [3].
The spacecraft reached the low perihelion by repeated gravity assists from Venus.
References:
- https://en.wikipedia.org/wiki/Parker_Solar_Probe
- http://parkersolarprobe.jhuapl.edu/The-Mission/index.php
- https://www.telegraph.co.uk/science/2018/08/09/nasa-probe-will-still-circling-sun-end-solar-system-say-scientists/
answered 17 hours ago
PolygnomePolygnome
4,08718 silver badges33 bronze badges
$endgroup$
1
$begingroup$
"It will then lose altitude (sic) control..." needs a source, there might be a possible mission extension unless you're sure that that's scheduled and inevitable.
$endgroup$
– uhoh
17 hours ago
1
$begingroup$
@uhoh I've included a link to an interview with the program manager of the parker solar probe as reference for that.
$endgroup$
– Polygnome
17 hours ago
4
$begingroup$
I'm pretty sure "altitude" should be "attitude" in that article.
$endgroup$
– JohannesD
9 hours ago
3
$begingroup$
Once it runs out of propellant and/or its reaction wheels fail loss of attitude control is inevitable. Components hiding behind the sun shield will get slagged down when exposed to direct solar radiation; but anything burned off I'd expect to be blown away in the solar wind. To fall into the sun, drag during its passes through the Corona would need to be sufficient to de-orbit the remnant. Is drag actually strong enough to accomplish that it was the interviewee speaking figuratively?
$endgroup$
– Dan Neely
7 hours ago
1
$begingroup$
@DanNeely I think drag is not enough for that. It will be still $approx$ 3 solar diameter away, and the solar atmospheric density decreases exponentially. After the loss of attitude control, the probe will quickly die, later starts to rotate. Probably its tungsten shield will last the longest, it is hard to calculate, when will it fully evaporate. Possible, that it is will survive until billions of years (note, it will heat only until $approx$ 2000C, and tungsten melts at 3400C).
$endgroup$
– peterh
3 hours ago
add a comment |
$begingroup$
No, not yet. The Parker Solar Probe became the closest ever artificial object to the sun on October 29th, 2018, surpassing Helios 2 which held the record since 1975 [1].
No other human-made object has been closer to the Sun. The probe will repeatedly touch the outer corona until mission end in 2025, with the closest approach being 3.83 million miles [2]. It will then lose altitude control and parts of it will likely fall into the sun in subsequent years [3].
The spacecraft reached the low perihelion by repeated gravity assists from Venus.
References:
- https://en.wikipedia.org/wiki/Parker_Solar_Probe
- http://parkersolarprobe.jhuapl.edu/The-Mission/index.php
- https://www.telegraph.co.uk/science/2018/08/09/nasa-probe-will-still-circling-sun-end-solar-system-say-scientists/
answered 17 hours ago
PolygnomePolygnome
4,08718 silver badges33 bronze badges
$endgroup$
No, not yet. The Parker Solar Probe became the closest ever artificial object to the sun on October 29th, 2018, surpassing Helios 2 which held the record since 1975 [1].
No other human-made object has been closer to the Sun. The probe will repeatedly touch the outer corona until mission end in 2025, with the closest approach being 3.83 million miles [2]. It will then lose altitude control and parts of it will likely fall into the sun in subsequent years [3].
The spacecraft reached the low perihelion by repeated gravity assists from Venus.
References:
- https://en.wikipedia.org/wiki/Parker_Solar_Probe
- http://parkersolarprobe.jhuapl.edu/The-Mission/index.php
- https://www.telegraph.co.uk/science/2018/08/09/nasa-probe-will-still-circling-sun-end-solar-system-say-scientists/
answered 17 hours ago
PolygnomePolygnome
4,08718 silver badges33 bronze badges
edited 17 hours ago
answered 17 hours ago
PolygnomePolygnome
4,08718 silver badges33 bronze badges
answered 17 hours ago
PolygnomePolygnome
4,08718 silver badges33 bronze badges
answered 17 hours ago
PolygnomePolygnome
4,08718 silver badges33 bronze badges
4,08718 silver badges33 bronze badges
1
$begingroup$
"It will then lose altitude (sic) control..." needs a source, there might be a possible mission extension unless you're sure that that's scheduled and inevitable.
$endgroup$
– uhoh
17 hours ago
1
$begingroup$
@uhoh I've included a link to an interview with the program manager of the parker solar probe as reference for that.
$endgroup$
– Polygnome
17 hours ago
4
$begingroup$
I'm pretty sure "altitude" should be "attitude" in that article.
$endgroup$
– JohannesD
9 hours ago
3
$begingroup$
Once it runs out of propellant and/or its reaction wheels fail loss of attitude control is inevitable. Components hiding behind the sun shield will get slagged down when exposed to direct solar radiation; but anything burned off I'd expect to be blown away in the solar wind. To fall into the sun, drag during its passes through the Corona would need to be sufficient to de-orbit the remnant. Is drag actually strong enough to accomplish that it was the interviewee speaking figuratively?
$endgroup$
– Dan Neely
7 hours ago
1
$begingroup$
@DanNeely I think drag is not enough for that. It will be still $approx$ 3 solar diameter away, and the solar atmospheric density decreases exponentially. After the loss of attitude control, the probe will quickly die, later starts to rotate. Probably its tungsten shield will last the longest, it is hard to calculate, when will it fully evaporate. Possible, that it is will survive until billions of years (note, it will heat only until $approx$ 2000C, and tungsten melts at 3400C).
$endgroup$
– peterh
3 hours ago
add a comment |
1
$begingroup$
"It will then lose altitude (sic) control..." needs a source, there might be a possible mission extension unless you're sure that that's scheduled and inevitable.
$endgroup$
– uhoh
17 hours ago
1
$begingroup$
@uhoh I've included a link to an interview with the program manager of the parker solar probe as reference for that.
$endgroup$
– Polygnome
17 hours ago
4
$begingroup$
I'm pretty sure "altitude" should be "attitude" in that article.
$endgroup$
– JohannesD
9 hours ago
3
$begingroup$
Once it runs out of propellant and/or its reaction wheels fail loss of attitude control is inevitable. Components hiding behind the sun shield will get slagged down when exposed to direct solar radiation; but anything burned off I'd expect to be blown away in the solar wind. To fall into the sun, drag during its passes through the Corona would need to be sufficient to de-orbit the remnant. Is drag actually strong enough to accomplish that it was the interviewee speaking figuratively?
$endgroup$
– Dan Neely
7 hours ago
1
$begingroup$
@DanNeely I think drag is not enough for that. It will be still $approx$ 3 solar diameter away, and the solar atmospheric density decreases exponentially. After the loss of attitude control, the probe will quickly die, later starts to rotate. Probably its tungsten shield will last the longest, it is hard to calculate, when will it fully evaporate. Possible, that it is will survive until billions of years (note, it will heat only until $approx$ 2000C, and tungsten melts at 3400C).
$endgroup$
– peterh
3 hours ago
1
1
$begingroup$
"It will then lose altitude (sic) control..." needs a source, there might be a possible mission extension unless you're sure that that's scheduled and inevitable.
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– uhoh
17 hours ago
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"It will then lose altitude (sic) control..." needs a source, there might be a possible mission extension unless you're sure that that's scheduled and inevitable.
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– uhoh
17 hours ago
1
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@uhoh I've included a link to an interview with the program manager of the parker solar probe as reference for that.
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– Polygnome
17 hours ago
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@uhoh I've included a link to an interview with the program manager of the parker solar probe as reference for that.
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– Polygnome
17 hours ago
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I'm pretty sure "altitude" should be "attitude" in that article.
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– JohannesD
9 hours ago
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I'm pretty sure "altitude" should be "attitude" in that article.
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– JohannesD
9 hours ago
3
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Once it runs out of propellant and/or its reaction wheels fail loss of attitude control is inevitable. Components hiding behind the sun shield will get slagged down when exposed to direct solar radiation; but anything burned off I'd expect to be blown away in the solar wind. To fall into the sun, drag during its passes through the Corona would need to be sufficient to de-orbit the remnant. Is drag actually strong enough to accomplish that it was the interviewee speaking figuratively?
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– Dan Neely
7 hours ago
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Once it runs out of propellant and/or its reaction wheels fail loss of attitude control is inevitable. Components hiding behind the sun shield will get slagged down when exposed to direct solar radiation; but anything burned off I'd expect to be blown away in the solar wind. To fall into the sun, drag during its passes through the Corona would need to be sufficient to de-orbit the remnant. Is drag actually strong enough to accomplish that it was the interviewee speaking figuratively?
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– Dan Neely
7 hours ago
1
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@DanNeely I think drag is not enough for that. It will be still $approx$ 3 solar diameter away, and the solar atmospheric density decreases exponentially. After the loss of attitude control, the probe will quickly die, later starts to rotate. Probably its tungsten shield will last the longest, it is hard to calculate, when will it fully evaporate. Possible, that it is will survive until billions of years (note, it will heat only until $approx$ 2000C, and tungsten melts at 3400C).
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– peterh
3 hours ago
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@DanNeely I think drag is not enough for that. It will be still $approx$ 3 solar diameter away, and the solar atmospheric density decreases exponentially. After the loss of attitude control, the probe will quickly die, later starts to rotate. Probably its tungsten shield will last the longest, it is hard to calculate, when will it fully evaporate. Possible, that it is will survive until billions of years (note, it will heat only until $approx$ 2000C, and tungsten melts at 3400C).
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– peterh
3 hours ago
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5
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"Has any object launched into space from Earth ... gone into the sun and never come out?" Could anything (except photons) go into the Sun and then come out?
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– RonJohn
7 hours ago
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@Ron - I kind of thought the same thing... How does something return from the sun? It has to be a one-way trip. For example, some of the debris from space junk and some of the debris from the Chinese blowing up that satellite have surely made it to the sun due to gravitational forces. How does the debris come back out?
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– jww
5 hours ago
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@RonJohn I've submitted an edit to remove the word "permanently" from the title, since it accomplishes nothing but confusing people who read it.
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– Monty Harder
4 hours ago
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Afaik it is $approx 41$ km/s. 13km/s to leave the Earth, 28 km/s to neutralize its orbital speed around the Sun. It is absolutely impossible with the todays technology. A very complex trajectory, like the Parker Solar Probe, using many gravitational slingshots, could get into the Sun in $approx$ a decade.
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– peterh
3 hours ago
1
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@RonJohn : If our coordinate system is anchored to the center of mass of the Sun, then other things fall into the Sun (since the Sun is always stationary in that coordinate system). TDB is an atomic timekeeping system that is based on a hypothetical atomic clock sitting at the CoM of the Solar system (which I usually don't bother to distinguish from the Sun's CoM since the distance between them is usually $leq$ a few hundred kilometers and the difference in redshifts between the two is small).
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– Eric Towers
1 hour ago