Planetary alignments: They're the favorite astronomical scenario of kooks, con artists, and Hollywood producers everywhere. But has it ever happened? And what would it do to Earth if it did?

An alignment of the Earth directly in between the Sun and the Moon, so that the earth's shadow falls on the Moon and obscures all or part of it.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just...