The Apollo 1 exploded on take off.
Here's an additional fact
The Cassini-Huygens mission was one of the most expensive ever!
+1 more
The Explorer 1 satellite rotated left and right 12 times per second. No one knew why.
Im sorry I have not been able to post a fact in the past few weeks I forgot about it and I also wasn't able to do it.
Appolo 1 actualy caught fire during a practice runthrough for the luanch