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As I know, some stars produces carbon, nitrogen and oxygen when they are old and become white dwarfs or neutron stars. And even their surface gravity is strong, it may rotate very fast so that the surface gravity is diminished, hence materials such as rocks and water can present at the surface normally.

My question is, is it possible for life (eg:bacteria) to survive on the equator of white dwarf or neutron star if it is cooled and rotate very fast? Or is it even possible for the equator of white dwarfs or neutron stars become the origin of life?

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    $\begingroup$ How are you simultaneously going to cool it and have it rapidly rotating? The situation you describe seems impossible because neutron stars and white dwarfs spin down as they cool. $\endgroup$ – Rob Jeffries Mar 10 '16 at 7:44
  • $\begingroup$ The surface gravity of a white dwarf is something like A LOT stronger than on Earth. Together with the degenerate matter and intense magnetic field probably nothing could survive there. Chemistry is different there than in our kitchen. $\endgroup$ – LocalFluff Mar 10 '16 at 16:08
  • $\begingroup$ @RobJeffries - I think the OP is asking about a hypothetical object cool enough and spinning fast enough. Gedankenexperiment if you will. $\endgroup$ – Florin Andrei Mar 10 '16 at 20:58
  • $\begingroup$ @FlorinAndrei Clearly I know it is hypothetical, since I pointed out it is not possible. You also have to hypothesise a neutron star with no magnetic field, since otherwise it will almost instantly spin down sufficiently to make gravity enormous again. $\endgroup$ – Rob Jeffries Mar 10 '16 at 21:34
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    $\begingroup$ Interesting and related: en.wikipedia.org/wiki/Dragon%27s_Egg $\endgroup$ – CDspace May 10 '16 at 22:09
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I am going to attempt a weak answer, mods feel free to delete it, but I'm fairly certain I'm right.

Shortly - no. It's not possible. Even if you balance gravity and centrifugal force perfectly at ground level at the equator, they will very, very quickly become imbalanced as soon as you move north, south, or up from there. So quickly in fact that the gradients may be too big even for a human being not moving at all. Maybe if you're laying down, with your body oriented along the equator, but even then I think the gradients would be too big.

Maybe bacteria would survive, briefly.

I'm sure the math could be done quite easily to estimate the gradients. This is based entirely on intuition.

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It is quite difficult to say about the presence of life, however it cannot be neglected as we know by researches that even on earth there are also many place where life was supposed to be impossible to exist but life exist . Now see average temperature on the surface of the dwarf star is about 2 times of our Sun's temperature and have more gravity and also the gases and liquids will not present at this much temperature hence it is very very difficult for life to exist there.

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