The only light that reaches the moon during a total lunar eclipse is light from the Earth's atmosphere, which projects onto the moon and gives it its reddish hue, USA TODAY previo

As the Full Worm Moon rose overnight, skywatchers across the Americas turned their eyes — and their cameras — toward the sky. Over several hours, Earth's shadow slowly crept across the lunar surface, turning our celestial neighbor into a deep, blood-red orb.

During the eclipse, the Earth passed between the sun and moon, blocking light from hitting the lunar surface, making the moon darker than usual. The moon turned a red hue, becoming a “blood moon,” due to the sunlight passing through Earth’s atmosphere before reaching its surface.