Original sentence: A collision between the elevator and the 22.2 km diameter moon would have to be avoided through active steering.However, building a Martian elevator would be a unique challenge because the Martian moon Phobos is in a low orbit, and intersects the equator regularly (twice every orbital period of 11 h 6 min)
Edited sentence: However, building a Martian elevator would be a unique challenge because Phobos is in a low orbit and would snap all but the most impossibly constructed tether