Retrograde Orbit
The orbit of a satellite where the satellite travels in a direction opposite to that direction of the planet's rotation.
The orbit of a satellite where the satellite travels in a direction opposite to that direction of the planet's rotation.
The amount of time that passes between the rising of Aries and another celestial object. Right ascension is one unit ...
A galaxy that has a ring-like appearance. The ring usually contains luminous blue stars. Ring galaxies are believed to have ...
The smallest distance from a planet or other body at which purely gravitational forces can hold together a satellite or ...