NASA explains how and why the yearly event occurs+ READ ARTICLE
Ever wondered why the full moon sometimes appears a dull red?
The “blood moon” lunar eclipse happens about twice a year—including early Wednesday morning—when the Sun, Earth and moon line up so that the moon passes through the Earth’s shadow, NASA explains in the video above. This causes moon to appear a dull red color due to sunlight scattered through the Earth’s atmosphere.
In other words, if you were to watch the eclipse from the moon, you’d see the Earth blocking the Sun, whose rays creep over the curves of the Earth, basking the moon in a red glow.