In ancient Egypt, Sirius was a true star of the night sky. It is the brightest star seen from Earth, easy to spot even without...
Pluto was discovered in 1930 by American astronomer Clyde Tombaugh. At the time, it was the ninth planet, right after Neptune, at the edge of...
The Moon rotates on its axis at exactly the same rate that it orbits the Earth. This is called synchronous rotation. Basically, it takes about...
