Moon phases are part of a 29.5-day lunar cycle, NASA tells us, caused by the angles between the sun, moon, and Earth. Moon phases are how the moon looks from Earth as it goes around us.

On June 29th, skywatchers are in for a treat as the Moon and Mars will appear in a close conjunction, only 0.2 degrees apart, visible to the naked eye shortly after sunset. Observers might witness ...

New Moon - The moon is between Earth and the sun, so the side we see is dark (in other words, it's invisible to the eye). Waxing Crescent - A small sliver of light appears on the right side ...