II. WE are in possession of numerous methods of computing double star orbits. Sir John Herschel gave orie of the first solutions of this problem, and his method has been used more than any other up to ...

Mathematicians think abstract tools from a field called symplectic geometry might help with planning missions to far-off moons and planets. In October, a Falcon Heavy rocket is scheduled to launch ...

Studying the orbits of thousands of exoplanets shows that large planets tend to have elliptical orbits, while smaller planets tend to have more circular orbits. This split coincides with several other ...