For the past couple of weeks, Earth's orbit has been home to a "mini-moon" the size of a city bus. The celestial object is ...

Written by the former chief historian of NASA, the book examines the evolution of our cosmic understanding—from early civilizations to the present day ...

A Sun-synchronous orbit (SSO), also called a heliosynchronous orbit, is a nearly polar orbit around a planet, in which the satellite passes over any given point of the planet's surface at the same ...