1) Black hole term
Found on
https://www.crosswordclues.com/clue/orbital-decay
In orbital mechanics, decay is a process that leads to gradual decrease of the distance between two orbiting bodies at their closest approach (the periapsis) over many orbital periods. These orbiting bodies can be a planet and its satellite, a star and any object orbiting it, or components of any binary system. The orbital decay can be caused by a...
Found on
http://en.wikipedia.org/wiki/Orbital_decay
No exact match found.
