Light covers 186,000 miles EVERY SECOND (kids, please don't try traveling ... trip travel time for radio waves between the Earth and the Moon. The Sun is 93 million miles away, so sunlight takes ...

If you need equipment for viewing the moon, check out our guide to the best telescopes and the best telescopes for kids ... Earth, is a sphere, and it is always half-illuminated by the sun.

Only when the moon, Earth and the sun are perfectly aligned is the moon 100% full. And sometimes — once in a blue moon — the moon is full twice in a month (or four times in a season ...

While a solar eclipse involves the moon passing between the sun and the Earth, casting a shadow across our planet, a lunar eclipse involves the Earth passing directly between the moon and the sun.