Sequence showing the Moon changing from crescent through full Moon and back
Solar System

How Do Moon Phases Work?

The Sun always illuminates roughly half of the Moon. So why don’t we always see a half Moon? The answer is that how much of that illuminated half we can see changes as the Moon …
Giant-impact Hypothesis
Astronomy Lists

Top Theories on How the Moon Formed

The Moon has been a constant source of wonder and fascination throughout mankind’s’ history, but despite being located a mere 238,900 miles or 1.28 light-seconds away, we know less about it and how it came …