When Appleoosa Station was destroyed, only Scootaloo's bravery saved two hundred souls from a cold, airless death. The problem is, her version of the story doesn't agree with the official account.
My name is Sunset Shimmer. I am the strongest unicorn in all of Equestria, and my life is over. I'm in hiding and on the run, and I have no idea where to start putting things back together.
Humanity's space exploration ultimately took the form of billions of identical probes, capable of building anything (including astronauts themselves) upon arrival at their destinations. One lands in Equestria. Things go downhill from there.