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Dec
23
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Oct
21
comment Why do stars appear to twinkle?
Well atmospheric pressure doesn't affect us all that much, not nearly as much as the gravity from the planet itself. Venus and Earth have similar gravity so the pressure is what makes us feel like we weigh more than we actually do in a thick atmosphere. Air pressure itself varies day by day, hour by hour, even second by second which is why a barograph(like a barometer but it graphs the pressure instead of just measuring it) has significant and tiny variations in air pressure. And we have been able to survive high and low air pressure for thousands of years.
Oct
21
comment Could we actually freeze a star?
If we were to get a little hydrogen into its solid state and somehow put it on the star than I bet that the rest of the hydrogen will freeze before that little bit becomes plasma, especially if it is put on the relatively cool surface of the star. This would stop nuclear fusion in the star and we would have left solid hydrogen and helium gas.
Oct
15
comment What is a parsec and how is it measured?
so a parsec is about the distance between us and Alpha Centauri.
Oct
15
comment Could we actually freeze a star?
They do actually fuse deuterium and lithium
Oct
15
comment length of Star lifetime
But if hydrogen is being fused that is a little bit of mass loss and wouldn't it be that gravitational pressure would outweigh the outward pressure from the star making the star smaller until all the hydrogen has been fused and then a helium flash occuring and then same thing with helium, carbon, neon, oxygen etc.
Oct
14
comment How can a planet not rotate at all and yet have 1 year that is day and 1 year that is night?
But still, even in mercury day to earth day conversion you would use the solar day which is 2 mercury years, not the sidereal day with its 3:2 resonance.
Oct
14
comment How can a planet not rotate at all and yet have 1 year that is day and 1 year that is night?
that is only considering the sidereal day. The one most important to us for discovering earth-like planets is the solar day length.
Oct
14
comment How can a planet not rotate at all and yet have 1 year that is day and 1 year that is night?
yes it does have days just like all our other planets
Oct
13
asked length of Star lifetime
Oct
13
answered When will all eight planets in our solar system align?
Oct
13
asked How can a planet not rotate at all and yet have 1 year that is day and 1 year that is night?
Oct
13
comment Is there a term for stars without any planets?
but if there is life in other solar systems than that life would consider the star they are orbiting around which isn't our star, "The Sun" because it is their sun. That is partly why a sun is not just our star but rather any star with planets around it.
Oct
13
asked Binary star not exceeding Roche Lobe?
Oct
10
comment Is there a term for stars without any planets?
Stars with planets orbiting them have a special term. They are considered suns.
Oct
10
comment How many stars can stay close to each other without collapsing?
en.wikipedia.org/wiki/Star_system#Septuple
Oct
10
comment How many stars can stay close to each other without collapsing?
We have found as many as 7 stars in a single star system.
Oct
10
comment Is Sun a part of a binary system?
Actually it doesn't mean that we aren't part of a binary star system. We could be orbiting 2 sun like stars and not even notice the difference, especially if it is an eclipsing binary system. The truth is that we don't know if our sun has a companion star or not, we only know that of stars farther away from us.
Oct
10
comment Average rate of supernova x number of stars
And even if it weren't finite, if we are in a multiverse, a second big bang that leads to similar things as the first one did would still be a possibility.
Oct
10
comment Average rate of supernova x number of stars
There has to be a finite number of quantum states. Nothing in real life can reach infinity. Not even quantum states of our universe(I say our universe because we might be in a multiverse where matter is exchanged via black holes and white holes so that we are at equilibrium in a multiverse).