Aaaand that would be a miniature Cybertron, the Transformers' home planet, hitting Earth. I know that world anywhere. That particular version is from War for Cybertron and Cybertron itself is actually about double to double and a half Earth's own radius, as seen in Dark of the Moon. It's not a small planet, to be sure. You might wanna be careful with that, Hasbro and High Moon studios could get ya for copyright.