![Spacepod show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/068/533/small/spacepod.jpg)
Summary: Jon talks about JPL’s Horizons, an amazing, publicly available system that keeps track of every known object in the solar system. Planets, moons, asteroids, spacecraft, you name it: over 715,000 in total. We discuss how this system is used by engineers, scientists, lawyers, art fans, and marine biologists.