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What is the hottest thing in the universe?
Limit of hotness!What is the radius of observable universe- 46 billion LY or 200 yottameters?Objects entering or leaving the observable universeHow can the observable universe be so small if there are so many stars in it?Since the Universe is expanding, is it accurate to say that a galaxy is 5 billion light years away?What fraction of galaxies in the observable universe have we actually observed?What is the present day radius of the observable universe?Where is the North of the UniverseHow much of the Universe is invisible to us, and how does it affect our theories?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}
$begingroup$
Straight from my 7 year old to you, exactly what it says on the cover:
What is the hottest thing in the universe?
To make it SO friendly, I'll add the following caveats:
- it should be bounded, as in an actual compact object, or class of objects, or part of an object
- it should be observable
- it should be an astronomical object, ie a Quark Gluon Plasma created by collisions at the Large Hadron Collider doesn't count.
Thanks,
Bruce
observable-universe heat
asked 22 hours ago
Bruce BeckerBruce Becker
2602 silver badges12 bronze badges
$endgroup$
|
show 3 more comments
$begingroup$
Straight from my 7 year old to you, exactly what it says on the cover:
What is the hottest thing in the universe?
To make it SO friendly, I'll add the following caveats:
- it should be bounded, as in an actual compact object, or class of objects, or part of an object
- it should be observable
- it should be an astronomical object, ie a Quark Gluon Plasma created by collisions at the Large Hadron Collider doesn't count.
Thanks,
Bruce
observable-universe heat
asked 22 hours ago
Bruce BeckerBruce Becker
2602 silver badges12 bronze badges
$endgroup$
$begingroup$
Possible duplicate of astronomy.stackexchange.com/q/8324/5506
$endgroup$
– Bruce Becker
22 hours ago
2
$begingroup$
I would recommend your 7-year old this video: youtube.com/watch?v=4fuHzC9aTik
$endgroup$
– SpaceBread
22 hours ago
1
$begingroup$
@BruceBecker I think the two questions are distinctly different. One asks for an astronomical object, the other seems ... entirely unrelated to astronomy, actually.
$endgroup$
– BMF
21 hours ago
$begingroup$
I assume you don't want to hear "the Big Bang", right? :) The question is a bit tricky because what we observe today isn't the hottest thing anymore (given the interstellar distances and speed of light); and if you do include things we only observe today as "the hottest thing right now", the Big Bang would probably still be the answer, since we're still bathing in the "afterglow" 15 billion years later.
$endgroup$
– Luaan
8 hours ago
12
$begingroup$
This would have been the perfect place for a "your mom" joke.
$endgroup$
– Borgh
8 hours ago
|
show 3 more comments
$begingroup$
Straight from my 7 year old to you, exactly what it says on the cover:
What is the hottest thing in the universe?
To make it SO friendly, I'll add the following caveats:
- it should be bounded, as in an actual compact object, or class of objects, or part of an object
- it should be observable
- it should be an astronomical object, ie a Quark Gluon Plasma created by collisions at the Large Hadron Collider doesn't count.
Thanks,
Bruce
observable-universe heat
asked 22 hours ago
Bruce BeckerBruce Becker
2602 silver badges12 bronze badges
$endgroup$
Straight from my 7 year old to you, exactly what it says on the cover:
What is the hottest thing in the universe?
To make it SO friendly, I'll add the following caveats:
- it should be bounded, as in an actual compact object, or class of objects, or part of an object
- it should be observable
- it should be an astronomical object, ie a Quark Gluon Plasma created by collisions at the Large Hadron Collider doesn't count.
Thanks,
Bruce
observable-universe heat
observable-universe heat
asked 22 hours ago
Bruce BeckerBruce Becker
2602 silver badges12 bronze badges
asked 22 hours ago
Bruce BeckerBruce Becker
2602 silver badges12 bronze badges
edited 1 hour ago
Bruce Becker
asked 22 hours ago
Bruce BeckerBruce Becker
2602 silver badges12 bronze badges
asked 22 hours ago
Bruce BeckerBruce Becker
2602 silver badges12 bronze badges
asked 22 hours ago
Bruce BeckerBruce Becker
2602 silver badges12 bronze badges
2602 silver badges12 bronze badges
$begingroup$
Possible duplicate of astronomy.stackexchange.com/q/8324/5506
$endgroup$
– Bruce Becker
22 hours ago
2
$begingroup$
I would recommend your 7-year old this video: youtube.com/watch?v=4fuHzC9aTik
$endgroup$
– SpaceBread
22 hours ago
1
$begingroup$
@BruceBecker I think the two questions are distinctly different. One asks for an astronomical object, the other seems ... entirely unrelated to astronomy, actually.
$endgroup$
– BMF
21 hours ago
$begingroup$
I assume you don't want to hear "the Big Bang", right? :) The question is a bit tricky because what we observe today isn't the hottest thing anymore (given the interstellar distances and speed of light); and if you do include things we only observe today as "the hottest thing right now", the Big Bang would probably still be the answer, since we're still bathing in the "afterglow" 15 billion years later.
$endgroup$
– Luaan
8 hours ago
12
$begingroup$
This would have been the perfect place for a "your mom" joke.
$endgroup$
– Borgh
8 hours ago
|
show 3 more comments
$begingroup$
Possible duplicate of astronomy.stackexchange.com/q/8324/5506
$endgroup$
– Bruce Becker
22 hours ago
2
$begingroup$
I would recommend your 7-year old this video: youtube.com/watch?v=4fuHzC9aTik
$endgroup$
– SpaceBread
22 hours ago
1
$begingroup$
@BruceBecker I think the two questions are distinctly different. One asks for an astronomical object, the other seems ... entirely unrelated to astronomy, actually.
$endgroup$
– BMF
21 hours ago
$begingroup$
I assume you don't want to hear "the Big Bang", right? :) The question is a bit tricky because what we observe today isn't the hottest thing anymore (given the interstellar distances and speed of light); and if you do include things we only observe today as "the hottest thing right now", the Big Bang would probably still be the answer, since we're still bathing in the "afterglow" 15 billion years later.
$endgroup$
– Luaan
8 hours ago
12
$begingroup$
This would have been the perfect place for a "your mom" joke.
$endgroup$
– Borgh
8 hours ago
$begingroup$
Possible duplicate of astronomy.stackexchange.com/q/8324/5506
$endgroup$
– Bruce Becker
22 hours ago
$begingroup$
Possible duplicate of astronomy.stackexchange.com/q/8324/5506
$endgroup$
– Bruce Becker
22 hours ago
2
2
$begingroup$
I would recommend your 7-year old this video: youtube.com/watch?v=4fuHzC9aTik
$endgroup$
– SpaceBread
22 hours ago
$begingroup$
I would recommend your 7-year old this video: youtube.com/watch?v=4fuHzC9aTik
$endgroup$
– SpaceBread
22 hours ago
1
1
$begingroup$
@BruceBecker I think the two questions are distinctly different. One asks for an astronomical object, the other seems ... entirely unrelated to astronomy, actually.
$endgroup$
– BMF
21 hours ago
$begingroup$
@BruceBecker I think the two questions are distinctly different. One asks for an astronomical object, the other seems ... entirely unrelated to astronomy, actually.
$endgroup$
– BMF
21 hours ago
$begingroup$
I assume you don't want to hear "the Big Bang", right? :) The question is a bit tricky because what we observe today isn't the hottest thing anymore (given the interstellar distances and speed of light); and if you do include things we only observe today as "the hottest thing right now", the Big Bang would probably still be the answer, since we're still bathing in the "afterglow" 15 billion years later.
$endgroup$
– Luaan
8 hours ago
$begingroup$
I assume you don't want to hear "the Big Bang", right? :) The question is a bit tricky because what we observe today isn't the hottest thing anymore (given the interstellar distances and speed of light); and if you do include things we only observe today as "the hottest thing right now", the Big Bang would probably still be the answer, since we're still bathing in the "afterglow" 15 billion years later.
$endgroup$
– Luaan
8 hours ago
12
12
$begingroup$
This would have been the perfect place for a "your mom" joke.
$endgroup$
– Borgh
8 hours ago
$begingroup$
This would have been the perfect place for a "your mom" joke.
$endgroup$
– Borgh
8 hours ago
|
show 3 more comments
2 Answers
2
active
oldest
votes
$begingroup$
Energetic neutrinos have been observed from the core of a supernova (SN 1987A). The inferred temperature at the "neutrinosphere" is about 4 MeV (equivalent to 50 billion K - Valentim et al. 2017). Hence it is observable and has been observed.
The very centre of the proto-neutron star that is responsible for the neutrino emission is likely to be a factor of two or so hotter, but cannot be observed, even with neutrinos, because the "neutrinosphere" is opaque to neutrinos. By the time this "clears", the proto-neutron star is much cooler - its surface would be orders of magnitude cooler.
Arguably we could study the very core of a supernova through gravitational waves if one were to explode in our own Galaxy. Whether this counts as "observing" a hot object, I'm not sure.
In a similar vein, we have observed "kilonova" that appear to be due to the merger of two neutron stars. The temperatures generated in these events are also likely to be of order 100 billion K, but again these temperatures are not observed directly - the gravitational waves and gamma rays produced in these events are caused by "non-thermal" mechanisms.
edited 3 hours ago
Federico
1278 bronze badges
answered 21 hours ago
Rob JeffriesRob Jeffries
58.4k4 gold badges120 silver badges193 bronze badges
$endgroup$
2
$begingroup$
How do we know it's the hottest thing?
$endgroup$
– Bruce Becker
20 hours ago
14
$begingroup$
@BruceBecker I guess we wait for someone to come up with something hotter.
$endgroup$
– Rob Jeffries
19 hours ago
$begingroup$
LOL now explain a neutrino and gravitational wave to a 7years old
$endgroup$
– BЈовић
3 hours ago
$begingroup$
@BЈовић Tomorrow that same seven-year-old will be explaining a (somewhat imperfect) version of it to all their friends on the playground...
$endgroup$
– Luke Sawczak
1 hour ago
$begingroup$
@BЈовић Gravitational wave: a wobble in the force due to gravity caused by the collison of two very massive objects - like the ripples on a pond when a stone is thrown in. Neutrino: a tiny, unseen particle, travelling at the speed of light, generated by extreme heat and that can pass through almost anything placed in its way.
$endgroup$
– Rob Jeffries
50 mins ago
add a comment |
$begingroup$
Note that while we haven't observed anything even close there is a theorized Absolute Hot along the lines of absolute zero. It's theorized value is ~ $1.416 cdot 10^{32}$ Kelvin. Above this temperature it would be impossible to pump more energy into a system, even gravitationally.
edited 8 hours ago
Glorfindel
3,0213 gold badges14 silver badges32 bronze badges
answered 9 hours ago
SoronelHaetirSoronelHaetir
1611 bronze badge
New contributor
SoronelHaetir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
1
$begingroup$
could you please fix that "it's"? thanks.
$endgroup$
– Federico
3 hours ago
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Energetic neutrinos have been observed from the core of a supernova (SN 1987A). The inferred temperature at the "neutrinosphere" is about 4 MeV (equivalent to 50 billion K - Valentim et al. 2017). Hence it is observable and has been observed.
The very centre of the proto-neutron star that is responsible for the neutrino emission is likely to be a factor of two or so hotter, but cannot be observed, even with neutrinos, because the "neutrinosphere" is opaque to neutrinos. By the time this "clears", the proto-neutron star is much cooler - its surface would be orders of magnitude cooler.
Arguably we could study the very core of a supernova through gravitational waves if one were to explode in our own Galaxy. Whether this counts as "observing" a hot object, I'm not sure.
In a similar vein, we have observed "kilonova" that appear to be due to the merger of two neutron stars. The temperatures generated in these events are also likely to be of order 100 billion K, but again these temperatures are not observed directly - the gravitational waves and gamma rays produced in these events are caused by "non-thermal" mechanisms.
edited 3 hours ago
Federico
1278 bronze badges
answered 21 hours ago
Rob JeffriesRob Jeffries
58.4k4 gold badges120 silver badges193 bronze badges
$endgroup$
2
$begingroup$
How do we know it's the hottest thing?
$endgroup$
– Bruce Becker
20 hours ago
14
$begingroup$
@BruceBecker I guess we wait for someone to come up with something hotter.
$endgroup$
– Rob Jeffries
19 hours ago
$begingroup$
LOL now explain a neutrino and gravitational wave to a 7years old
$endgroup$
– BЈовић
3 hours ago
$begingroup$
@BЈовић Tomorrow that same seven-year-old will be explaining a (somewhat imperfect) version of it to all their friends on the playground...
$endgroup$
– Luke Sawczak
1 hour ago
$begingroup$
@BЈовић Gravitational wave: a wobble in the force due to gravity caused by the collison of two very massive objects - like the ripples on a pond when a stone is thrown in. Neutrino: a tiny, unseen particle, travelling at the speed of light, generated by extreme heat and that can pass through almost anything placed in its way.
$endgroup$
– Rob Jeffries
50 mins ago
add a comment |
$begingroup$
Energetic neutrinos have been observed from the core of a supernova (SN 1987A). The inferred temperature at the "neutrinosphere" is about 4 MeV (equivalent to 50 billion K - Valentim et al. 2017). Hence it is observable and has been observed.
The very centre of the proto-neutron star that is responsible for the neutrino emission is likely to be a factor of two or so hotter, but cannot be observed, even with neutrinos, because the "neutrinosphere" is opaque to neutrinos. By the time this "clears", the proto-neutron star is much cooler - its surface would be orders of magnitude cooler.
Arguably we could study the very core of a supernova through gravitational waves if one were to explode in our own Galaxy. Whether this counts as "observing" a hot object, I'm not sure.
In a similar vein, we have observed "kilonova" that appear to be due to the merger of two neutron stars. The temperatures generated in these events are also likely to be of order 100 billion K, but again these temperatures are not observed directly - the gravitational waves and gamma rays produced in these events are caused by "non-thermal" mechanisms.
edited 3 hours ago
Federico
1278 bronze badges
answered 21 hours ago
Rob JeffriesRob Jeffries
58.4k4 gold badges120 silver badges193 bronze badges
$endgroup$
2
$begingroup$
How do we know it's the hottest thing?
$endgroup$
– Bruce Becker
20 hours ago
14
$begingroup$
@BruceBecker I guess we wait for someone to come up with something hotter.
$endgroup$
– Rob Jeffries
19 hours ago
$begingroup$
LOL now explain a neutrino and gravitational wave to a 7years old
$endgroup$
– BЈовић
3 hours ago
$begingroup$
@BЈовић Tomorrow that same seven-year-old will be explaining a (somewhat imperfect) version of it to all their friends on the playground...
$endgroup$
– Luke Sawczak
1 hour ago
$begingroup$
@BЈовић Gravitational wave: a wobble in the force due to gravity caused by the collison of two very massive objects - like the ripples on a pond when a stone is thrown in. Neutrino: a tiny, unseen particle, travelling at the speed of light, generated by extreme heat and that can pass through almost anything placed in its way.
$endgroup$
– Rob Jeffries
50 mins ago
add a comment |
$begingroup$
Energetic neutrinos have been observed from the core of a supernova (SN 1987A). The inferred temperature at the "neutrinosphere" is about 4 MeV (equivalent to 50 billion K - Valentim et al. 2017). Hence it is observable and has been observed.
The very centre of the proto-neutron star that is responsible for the neutrino emission is likely to be a factor of two or so hotter, but cannot be observed, even with neutrinos, because the "neutrinosphere" is opaque to neutrinos. By the time this "clears", the proto-neutron star is much cooler - its surface would be orders of magnitude cooler.
Arguably we could study the very core of a supernova through gravitational waves if one were to explode in our own Galaxy. Whether this counts as "observing" a hot object, I'm not sure.
In a similar vein, we have observed "kilonova" that appear to be due to the merger of two neutron stars. The temperatures generated in these events are also likely to be of order 100 billion K, but again these temperatures are not observed directly - the gravitational waves and gamma rays produced in these events are caused by "non-thermal" mechanisms.
edited 3 hours ago
Federico
1278 bronze badges
answered 21 hours ago
Rob JeffriesRob Jeffries
58.4k4 gold badges120 silver badges193 bronze badges
$endgroup$
Energetic neutrinos have been observed from the core of a supernova (SN 1987A). The inferred temperature at the "neutrinosphere" is about 4 MeV (equivalent to 50 billion K - Valentim et al. 2017). Hence it is observable and has been observed.
The very centre of the proto-neutron star that is responsible for the neutrino emission is likely to be a factor of two or so hotter, but cannot be observed, even with neutrinos, because the "neutrinosphere" is opaque to neutrinos. By the time this "clears", the proto-neutron star is much cooler - its surface would be orders of magnitude cooler.
Arguably we could study the very core of a supernova through gravitational waves if one were to explode in our own Galaxy. Whether this counts as "observing" a hot object, I'm not sure.
In a similar vein, we have observed "kilonova" that appear to be due to the merger of two neutron stars. The temperatures generated in these events are also likely to be of order 100 billion K, but again these temperatures are not observed directly - the gravitational waves and gamma rays produced in these events are caused by "non-thermal" mechanisms.
edited 3 hours ago
Federico
1278 bronze badges
answered 21 hours ago
Rob JeffriesRob Jeffries
58.4k4 gold badges120 silver badges193 bronze badges
edited 3 hours ago
Federico
1278 bronze badges
edited 3 hours ago
Federico
1278 bronze badges
edited 3 hours ago
Federico
1278 bronze badges
1278 bronze badges
answered 21 hours ago
Rob JeffriesRob Jeffries
58.4k4 gold badges120 silver badges193 bronze badges
answered 21 hours ago
Rob JeffriesRob Jeffries
58.4k4 gold badges120 silver badges193 bronze badges
answered 21 hours ago
Rob JeffriesRob Jeffries
58.4k4 gold badges120 silver badges193 bronze badges
58.4k4 gold badges120 silver badges193 bronze badges
2
$begingroup$
How do we know it's the hottest thing?
$endgroup$
– Bruce Becker
20 hours ago
14
$begingroup$
@BruceBecker I guess we wait for someone to come up with something hotter.
$endgroup$
– Rob Jeffries
19 hours ago
$begingroup$
LOL now explain a neutrino and gravitational wave to a 7years old
$endgroup$
– BЈовић
3 hours ago
$begingroup$
@BЈовић Tomorrow that same seven-year-old will be explaining a (somewhat imperfect) version of it to all their friends on the playground...
$endgroup$
– Luke Sawczak
1 hour ago
$begingroup$
@BЈовић Gravitational wave: a wobble in the force due to gravity caused by the collison of two very massive objects - like the ripples on a pond when a stone is thrown in. Neutrino: a tiny, unseen particle, travelling at the speed of light, generated by extreme heat and that can pass through almost anything placed in its way.
$endgroup$
– Rob Jeffries
50 mins ago
add a comment |
2
$begingroup$
How do we know it's the hottest thing?
$endgroup$
– Bruce Becker
20 hours ago
14
$begingroup$
@BruceBecker I guess we wait for someone to come up with something hotter.
$endgroup$
– Rob Jeffries
19 hours ago
$begingroup$
LOL now explain a neutrino and gravitational wave to a 7years old
$endgroup$
– BЈовић
3 hours ago
$begingroup$
@BЈовић Tomorrow that same seven-year-old will be explaining a (somewhat imperfect) version of it to all their friends on the playground...
$endgroup$
– Luke Sawczak
1 hour ago
$begingroup$
@BЈовић Gravitational wave: a wobble in the force due to gravity caused by the collison of two very massive objects - like the ripples on a pond when a stone is thrown in. Neutrino: a tiny, unseen particle, travelling at the speed of light, generated by extreme heat and that can pass through almost anything placed in its way.
$endgroup$
– Rob Jeffries
50 mins ago
2
2
$begingroup$
How do we know it's the hottest thing?
$endgroup$
– Bruce Becker
20 hours ago
$begingroup$
How do we know it's the hottest thing?
$endgroup$
– Bruce Becker
20 hours ago
14
14
$begingroup$
@BruceBecker I guess we wait for someone to come up with something hotter.
$endgroup$
– Rob Jeffries
19 hours ago
$begingroup$
@BruceBecker I guess we wait for someone to come up with something hotter.
$endgroup$
– Rob Jeffries
19 hours ago
$begingroup$
LOL now explain a neutrino and gravitational wave to a 7years old
$endgroup$
– BЈовић
3 hours ago
$begingroup$
LOL now explain a neutrino and gravitational wave to a 7years old
$endgroup$
– BЈовић
3 hours ago
$begingroup$
@BЈовић Tomorrow that same seven-year-old will be explaining a (somewhat imperfect) version of it to all their friends on the playground...
$endgroup$
– Luke Sawczak
1 hour ago
$begingroup$
@BЈовић Tomorrow that same seven-year-old will be explaining a (somewhat imperfect) version of it to all their friends on the playground...
$endgroup$
– Luke Sawczak
1 hour ago
$begingroup$
@BЈовић Gravitational wave: a wobble in the force due to gravity caused by the collison of two very massive objects - like the ripples on a pond when a stone is thrown in. Neutrino: a tiny, unseen particle, travelling at the speed of light, generated by extreme heat and that can pass through almost anything placed in its way.
$endgroup$
– Rob Jeffries
50 mins ago
$begingroup$
@BЈовић Gravitational wave: a wobble in the force due to gravity caused by the collison of two very massive objects - like the ripples on a pond when a stone is thrown in. Neutrino: a tiny, unseen particle, travelling at the speed of light, generated by extreme heat and that can pass through almost anything placed in its way.
$endgroup$
– Rob Jeffries
50 mins ago
add a comment |
$begingroup$
Note that while we haven't observed anything even close there is a theorized Absolute Hot along the lines of absolute zero. It's theorized value is ~ $1.416 cdot 10^{32}$ Kelvin. Above this temperature it would be impossible to pump more energy into a system, even gravitationally.
edited 8 hours ago
Glorfindel
3,0213 gold badges14 silver badges32 bronze badges
answered 9 hours ago
SoronelHaetirSoronelHaetir
1611 bronze badge
New contributor
SoronelHaetir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
1
$begingroup$
could you please fix that "it's"? thanks.
$endgroup$
– Federico
3 hours ago
add a comment |
$begingroup$
Note that while we haven't observed anything even close there is a theorized Absolute Hot along the lines of absolute zero. It's theorized value is ~ $1.416 cdot 10^{32}$ Kelvin. Above this temperature it would be impossible to pump more energy into a system, even gravitationally.
edited 8 hours ago
Glorfindel
3,0213 gold badges14 silver badges32 bronze badges
answered 9 hours ago
SoronelHaetirSoronelHaetir
1611 bronze badge
New contributor
SoronelHaetir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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1
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could you please fix that "it's"? thanks.
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– Federico
3 hours ago
add a comment |
$begingroup$
Note that while we haven't observed anything even close there is a theorized Absolute Hot along the lines of absolute zero. It's theorized value is ~ $1.416 cdot 10^{32}$ Kelvin. Above this temperature it would be impossible to pump more energy into a system, even gravitationally.
edited 8 hours ago
Glorfindel
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answered 9 hours ago
SoronelHaetirSoronelHaetir
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Note that while we haven't observed anything even close there is a theorized Absolute Hot along the lines of absolute zero. It's theorized value is ~ $1.416 cdot 10^{32}$ Kelvin. Above this temperature it would be impossible to pump more energy into a system, even gravitationally.
edited 8 hours ago
Glorfindel
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answered 9 hours ago
SoronelHaetirSoronelHaetir
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edited 8 hours ago
Glorfindel
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edited 8 hours ago
Glorfindel
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edited 8 hours ago
Glorfindel
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3,0213 gold badges14 silver badges32 bronze badges
answered 9 hours ago
SoronelHaetirSoronelHaetir
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answered 9 hours ago
SoronelHaetirSoronelHaetir
1611 bronze badge
answered 9 hours ago
SoronelHaetirSoronelHaetir
1611 bronze badge
1611 bronze badge
New contributor
SoronelHaetir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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New contributor
SoronelHaetir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
$begingroup$
could you please fix that "it's"? thanks.
$endgroup$
– Federico
3 hours ago
add a comment |
1
$begingroup$
could you please fix that "it's"? thanks.
$endgroup$
– Federico
3 hours ago
1
1
$begingroup$
could you please fix that "it's"? thanks.
$endgroup$
– Federico
3 hours ago
$begingroup$
could you please fix that "it's"? thanks.
$endgroup$
– Federico
3 hours ago
add a comment |
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Possible duplicate of astronomy.stackexchange.com/q/8324/5506
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– Bruce Becker
22 hours ago
2
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I would recommend your 7-year old this video: youtube.com/watch?v=4fuHzC9aTik
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– SpaceBread
22 hours ago
1
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@BruceBecker I think the two questions are distinctly different. One asks for an astronomical object, the other seems ... entirely unrelated to astronomy, actually.
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– BMF
21 hours ago
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I assume you don't want to hear "the Big Bang", right? :) The question is a bit tricky because what we observe today isn't the hottest thing anymore (given the interstellar distances and speed of light); and if you do include things we only observe today as "the hottest thing right now", the Big Bang would probably still be the answer, since we're still bathing in the "afterglow" 15 billion years later.
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– Luaan
8 hours ago
12
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This would have been the perfect place for a "your mom" joke.
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– Borgh
8 hours ago