As the moon reflects the sun's light, the shadow dims the moon's glow. During the peak of a total lunar eclipse, the moon takes on a bit of a reddish hue as any leftover sunlight making it to the moon's surface is scattered by our earth's atmosphere.

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.

When sunlight hits Earth’s atmosphere during a lunar eclipse, light frequencies toward the blue end of the visible spectrum are scattered outward, away from Earth’s umbra, but those with longer wavelengths, toward the red part of the spectrum, are bent inward and cast onto the moon.