In August 1960, NASA launched its first communications satellite, Echo 1. Fifty years later, NASA has achieved another first by placing the ARTEMIS-P1 spacecraft into a unique orbit behind the moon, ...
As lunar exploration intensifies, the cislunar space is experiencing increasing congestion. Traditional two-body Keplerian elements, which have long been the standard for Earth-orbiting objects, prove ...
The libration of the moon, and changes in its actual size as seen from Earth, are beautifully illustrated in the movie linked to at the bottom of this Astronomy Picture of the Day page. (Note: Wait ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results