3 ms·

Umm, I don't know but would guess water-ice sublimes over time in a vacuum.

• idlewords 4y ago
  The rings of Saturn are almost entirely little chunks of water ice, and they are stable over many hundreds of millions of years. Cold ice (below about 150K) has a very low vapor pressure.
• sandworm101 4y ago
  Sublimates in one place, condenses in another. It moves from sunny parts of a body to darker parts. And since everything is rotating, the net effect is minimal.
  • Nomentatus 4y ago
    For that to happen, it can't be gravity that keeps a single molecule near long enough for that to happen - dipole forces at a fairly large distance in vacuum over enough time... maybe... at enough distance from the sun. Maybe. Maybe. Static electrical field from the asteroid, stoked by the sun?