The Regolith of Asteroid Eros
Credit: NEAR Project, JHU APL, NASA

Explanation: From fifty kilometres above asteroid Eros, the surface inside one of its largest craters appears covered with an unusual substance: regolith. The thickness and composition of the surface dust that is regolith remains a topic of much research. Much of the regolith on 433 Eros was probably created by numerous small impacts during its long history. In this representative-colour view taken by the robot spacecraft NEAR-SHOEMAKER that orbiting Eros from in 2000 and 2001, brown areas indicate regolith that has been chemically altered by exposure to the solar wind during micrometeorite impacts. White areas are thought to have undergone relatively less exposure. The boulders visible inside the crater appear brown, indicating either that they are old enough to have a surface itself tanned by the solar wind, or that they have somehow become covered with some dark surface regolith.

APOD never seems to run out of pictures. It makes me wonder what good stuff they're holding back from us.

We just don't know where to look.

I go through the archives from time to time, and they have amazing stuff. And they have been going since 1998

complex from space on it, and where I work, and a bunch of neat stuff. I just looked now, though, and can't find my bookmark for it.

that was made of satelite photos. It was expensive, so I didn't buy it. But I felt really tempted.

There is one of my area as well, but I'm unwilling to part with that much cash for a book of pictures when I can get the equivalent of most of the pictures on the web.

They are great to look through though.

The one we had here wasn't exorbitant. Just more than I was willing to spend. They are printed on good paper, after all. And it's not easy to put something like that together.