For example, some boulders seem to have just disintegrated on the surface. We've also seen that some of the fine surface material moves downhill, filling low areas and creating flat surfaces in craters, even with Eros' low gravity. These are big puzzles and we need to get a better look. |
The damn thing is layered like a frozen onion. |
We believe they hold the most primitive materials in the solar system and that they played a role in shaping some of the planets, but we really have more ideas about comets than facts. |
When we see comets up in the sky they're really spectacular. But unless you get close to a comet, you can't really figure out what's going on. |