Lest we forget, it was more than two years ago that this little wobbling thing was photographed by the Spirit Rover, zipping through the Martian sky.
And the explanation? Well, I guess we just never got around to looking at it any closer. Busy, busy, busy!
Anyway, here it is again, the thing that probably shouldn't be there:
Yes, there is enough atmosphere.
Thats why they have to put heat shields on landers, such as the current Rovers, and previous surface missions. It does get hot.
We also know that meteors are affected by the atmosphere because we found a meteorite! and by coincidence, Opportunity's Heat sheild landed right
next to it.