- There is a moon of Saturn which has lakes made of polyethylene.
- One moon of Saturn has volcanoes which spew ice into space...those ice chunks are a large part of Saturn's rings.
- The Hubble has photographed dark matter.
- Mars has huge ice sheets below its surface.
These discoveries make me realize how much more exciting science is than scifi. Sorry I don't have links for any of these, but I'm gonna start posting this kind of stuff when I see it.