APOD: 2008 July 23 - High Cliffs Surrounding Echus Chasma on Mars This is the kind of APOD I like: nobody really knows what’s going on here. This one is also great because I was sure it was an illustration. Nope—it’s a photo from the Mars Express orbiter. It really looks like an illustration in a science book from the 50s or 60s.

APOD: 2008 July 23 - High Cliffs Surrounding Echus Chasma on Mars

This is the kind of APOD I like: nobody really knows what’s going on here. This one is also great because I was sure it was an illustration. Nope—it’s a photo from the Mars Express orbiter. It really looks like an illustration in a science book from the 50s or 60s.