Looks like a rock to me.

Me, too.

lololo, me three

Venus visitor's remains?

It has to be a rock. How would a skull get there with no other bones around. Unless Marvin The Martian is real. He's a walking head isn't he?

Send Spirit back and take another picture at a different time of day. Even the most stalwart alien hunter will have to admit this was a trick of shadows then. Just like it's been every time someone yells "ALIEN!" at a NASA photo of another planet.

What?! Is that the Virgin Mary in the background?

A virgin? Where?

Can't we just go up to it and see? Or just send a fuckin' robot to do it?

I always wondered what happened to Alf. Maybe the giant Martian cats got him.