The Moon
A lunar eclipse occurs when Earth blocks sunlight from reaching the Moon.
A lunar eclipse happens when the Moon passes through Earth's shadow, which can only occur during a full moon. In a total eclipse the Moon turns a coppery red.
For a lunar eclipse to occur, the Sun, Earth, and Moon must be closely aligned, which usually happens twice a year around the eclipse seasons.
During totality, sunlight refracted through Earth's atmosphere bathes the Moon in a reddish glow — the so-called Blood Moon.
Yes. Unlike a solar eclipse, a lunar eclipse is completely safe to view without any protection.