I have a bit of time on my hands, so let's do another 24h round of #AskAnAstrophysicist, but this time it's a thematic one.
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I have a bit of time on my hands, so let's do another 24h round of #AskAnAstrophysicist, but this time it's a thematic one.
What do you want to ask an astrophysicist about stars? (I am a professional astrophysicist, part of whose work concerns itself with high mass stars & their winds and I've also taught a variety of astro university courses)
Boosts welcome. I may not be able to reply to all in case of many questions.
@vicgrinberg how can one know the size / mass of a star and their relative distances one to another, and to us.
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I have a bit of time on my hands, so let's do another 24h round of #AskAnAstrophysicist, but this time it's a thematic one.
What do you want to ask an astrophysicist about stars? (I am a professional astrophysicist, part of whose work concerns itself with high mass stars & their winds and I've also taught a variety of astro university courses)
Boosts welcome. I may not be able to reply to all in case of many questions.
@vicgrinberg Are there solar systems out there where a star has a smaller star in its orbit?
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@vicgrinberg I boosted, but I never really learned anything about stars, so I feel totally inadequate to be asking a question. But thanks for doing this.
@johnnythan @vicgrinberg Seconded - I'm the same. I don't know enough to ask a question but am fascinated by the answers. And the questions! Thank you for sharing your time and knowledge. Great thread.
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I have a bit of time on my hands, so let's do another 24h round of #AskAnAstrophysicist, but this time it's a thematic one.
What do you want to ask an astrophysicist about stars? (I am a professional astrophysicist, part of whose work concerns itself with high mass stars & their winds and I've also taught a variety of astro university courses)
Boosts welcome. I may not be able to reply to all in case of many questions.
@vicgrinberg Is there any sensible answer to the question of what's going on inside the event horizon of a black hole?
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@Nephele to me, doing science is like doing art, it's deeply human. The first humans pressed their ocher red hands onto walls of caves and it still touches me. The same way science and trying to understand the world touches something deep in the human soul. When we stop doing art and trying to understand the world (so doing science), we stop being human.
And *hugs* it's hard times...
@vicgrinberg @Nephele This
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@vicgrinberg @sianderl @ec_euclid
OK, but many thanks for your answer anyway!
Mhm, another question regarding red dwarfs (like Proxima Centauri):
Red dwarfs may sound harmless at first, but they are much more dangerous for nearby planets (and any potential life) due to intense flares and CMEs, as well as strong magnetic fields that fluctuate considerably.
Is the only reason for this that heat transfer in these stars is convective (meaning the interior is well “stirred up” and therefore rather inhomogenous ) or are there further reasons for this behaviour?
In stars like the Sun, heat transfer occurs internally via radiation and in the outer layers via convection, without things being so uncomfortable all around....
@echopapa it's the convection and the often fast rotation - both tend to tangle the magnetic fields more leading to a higher flare rate. Very close in exoplanets could also trigger flares, again via magnetic interaction https://www.skyatnightmagazine.com/space-science/exoplanets-close-cause-solar-flares
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I have a bit of time on my hands, so let's do another 24h round of #AskAnAstrophysicist, but this time it's a thematic one.
What do you want to ask an astrophysicist about stars? (I am a professional astrophysicist, part of whose work concerns itself with high mass stars & their winds and I've also taught a variety of astro university courses)
Boosts welcome. I may not be able to reply to all in case of many questions.
@vicgrinberg there's a legend about Sirius A that used to be red before being blue. Is there any way for stars, aside from aging, to "suddenly" or not-so-suddenly change color in their lifetime?
I mostly have in mind depictions from movies where a star gets eaten by star-goo and turns green; or a "supernova-weapon" turns it an otherworldly color before it, well, goes supernova.
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@vicgrinberg Can something be a star and a black hole at the same time?
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I have a bit of time on my hands, so let's do another 24h round of #AskAnAstrophysicist, but this time it's a thematic one.
What do you want to ask an astrophysicist about stars? (I am a professional astrophysicist, part of whose work concerns itself with high mass stars & their winds and I've also taught a variety of astro university courses)
Boosts welcome. I may not be able to reply to all in case of many questions.
@vicgrinberg do most stars generate energy from nuclear fusion of hydrogen (as I understand it, like our sun) and other increasingly heavy elements? Are there other sources of energy harnessed by stars?
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I have a bit of time on my hands, so let's do another 24h round of #AskAnAstrophysicist, but this time it's a thematic one.
What do you want to ask an astrophysicist about stars? (I am a professional astrophysicist, part of whose work concerns itself with high mass stars & their winds and I've also taught a variety of astro university courses)
Boosts welcome. I may not be able to reply to all in case of many questions.
@vicgrinberg upper mass limit? Eddington limit still a thing? Deneb is my spirit star (Actually Vega, but that’s not high mass)
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@vicgrinberg what would happen to your arm if you raised it while the lightspeed is 0?
@trrektor
If light speed were zero humans would not exist and not have arms.
@vicgrinberg -
@vicgrinberg That makes sense. Would heavier metals be expected in the cores of gas and ice giant planets?
@Enema_Cowboy likely yes - but it's not that simple, eg NASA's Juno found that Jupiter core is rather "fuzzy" and not just a ball of heavy elements https://science.nasa.gov/jupiter/jupiter-facts/
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I have a bit of time on my hands, so let's do another 24h round of #AskAnAstrophysicist, but this time it's a thematic one.
What do you want to ask an astrophysicist about stars? (I am a professional astrophysicist, part of whose work concerns itself with high mass stars & their winds and I've also taught a variety of astro university courses)
Boosts welcome. I may not be able to reply to all in case of many questions.
what's the biggest star system seen?
what's the biggest star system theoretically?
i was reading about Nu Scorpii the other day, a seven star system, which blew my mind
besides the stable binary star systems, are all large star systems simply young star systems bound to break up?
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I have a bit of time on my hands, so let's do another 24h round of #AskAnAstrophysicist, but this time it's a thematic one.
What do you want to ask an astrophysicist about stars? (I am a professional astrophysicist, part of whose work concerns itself with high mass stars & their winds and I've also taught a variety of astro university courses)
Boosts welcome. I may not be able to reply to all in case of many questions.
@vicgrinberg we have several evocative descriptions of what space smells like https://www.mentalfloss.com/science/space/what-outer-space-smells-like
But, what about the stars you study? What's their scent?
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I have a bit of time on my hands, so let's do another 24h round of #AskAnAstrophysicist, but this time it's a thematic one.
What do you want to ask an astrophysicist about stars? (I am a professional astrophysicist, part of whose work concerns itself with high mass stars & their winds and I've also taught a variety of astro university courses)
Boosts welcome. I may not be able to reply to all in case of many questions.
@vicgrinberg How bad has Starlink become to hinder professional examination of the stars from earth or does it all depend on the space telescopes now?
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@trrektor
If light speed were zero humans would not exist and not have arms.
@vicgrinberg@notsoloud @vicgrinberg nah in this example it's turned to zero while existing
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I have a bit of time on my hands, so let's do another 24h round of #AskAnAstrophysicist, but this time it's a thematic one.
What do you want to ask an astrophysicist about stars? (I am a professional astrophysicist, part of whose work concerns itself with high mass stars & their winds and I've also taught a variety of astro university courses)
Boosts welcome. I may not be able to reply to all in case of many questions.
@vicgrinberg How much impact does dark matter have on stars? (Does the extra gravity influence internal processes, the number of CMEs, etc.) How much does it vary based upon the star's size? Is there the same relative regular matter to dark matter ratio regardless of size?
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I have a bit of time on my hands, so let's do another 24h round of #AskAnAstrophysicist, but this time it's a thematic one.
What do you want to ask an astrophysicist about stars? (I am a professional astrophysicist, part of whose work concerns itself with high mass stars & their winds and I've also taught a variety of astro university courses)
Boosts welcome. I may not be able to reply to all in case of many questions.
@vicgrinberg Maybe more of a physics question than a star question; if so, I apologize: what is your take on the new possibility that black holes may not contain singularities after all?
https://www.sciencenewstoday.org/no-more-singularity-physicists-propose-new-black-hole-paradigms
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I have a bit of time on my hands, so let's do another 24h round of #AskAnAstrophysicist, but this time it's a thematic one.
What do you want to ask an astrophysicist about stars? (I am a professional astrophysicist, part of whose work concerns itself with high mass stars & their winds and I've also taught a variety of astro university courses)
Boosts welcome. I may not be able to reply to all in case of many questions.
@vicgrinberg How rare is gold in the universe.
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I have a bit of time on my hands, so let's do another 24h round of #AskAnAstrophysicist, but this time it's a thematic one.
What do you want to ask an astrophysicist about stars? (I am a professional astrophysicist, part of whose work concerns itself with high mass stars & their winds and I've also taught a variety of astro university courses)
Boosts welcome. I may not be able to reply to all in case of many questions.
Since I have not seen the question already: What are those winds you mentioned? How can I imagine them? I suspect stars don't have an atmosphere like planets do.
I am so confused.
