So you where a Project from NASA to...
I was developed to travel to Alien worlds, learn their cultures, languages and everything about thier history and civilisations.
Then, when all data was collected, I gots to destroy their planet!
-D
But sadly, I was captured on a far away planet, and re-programmed to...Destroy Mankind! Yay!
But now that you know...*Pulls out deadly lazer* Heh heh heh...