Thanks for the comments!
since Gravity is out now, you might consider adding a tie in
That's a good idea, but I can't think of a way to do it that I'm happy with. This chapter takes place in November 2011, in a world very much like ours (I only wanted to change the bare minimum).
According to IMDB,
Gravity takes place in 2014/2015 on shuttle mission STS-157, but in our world, the shuttle stopped flying with STS-135 in July 2011, three months before Kara came to Emily's world. Also,
Gravity is a great movie, but it has a number of scientific errors I'd rather not reproduce.
So in Emily's world,
Gravity is a movie, the same as in ours.
According to Wikipedia,
Gravity started filming in May 2011, so by November I'm guessing they would have finished principal photography and started post-production. I imagine in Emily's world the producers and director might be tearing their hair out with the news of Supergirl's latest feat.