[FroggyTheGremlim]

At top center is clearly the face of an alien carved like the Easter Island statues. /s

But seriously, there appear to be crystals and rock structures.

Very interesting.

[Organic Panic]

Im before the Helen Thomas picture.

[Big Giant Head]

Looks like petrified TreeBeard.

[Lonesome in Massachussets]

At top center is clearly the face of an alien carved like the Easter Island statues. /s

No, no, look, the shadows are all wrong. I perspective is phony. Definitely filmed in a back lot a Pinewood Studios.

[Prophet2520]

Funny guys. I was thinking along the same line but you beat me to it. Are we sure that aliens didn’t send this hurtling toward earth, and this was actually a comet-redirect, save-the-planet mission?

Seriously though in spite of what NASA and others say below, it looks pretty rocky to me.
from http://spaceplace.nasa.gov/comet-nucleus/en/
“A comet’s nucleus is like a dirty snowball made of ice. As the comet gets closer to the Sun, some of the ice starts to melt and boil off, along with particles of dust. “

[kjam22]

Pretty sure I saw some Stonehenge rocks on that comet... Really it looks like a big rock to me....