A total lunar eclipse will make the moon appear red during the across the Western Hemisphere during the "Blood Worm Moon" this week.

During a lunar eclipse, which is when the Earth lines up exactly between the moon and the sun, the moon appears darker because the Earth obscures the sun with its shadow. Only light from Earth’s atmosphere reaches the moon, which can tint the moon reddish with light reflected from sunsets and sunrises on Earth.

Late Thursday into the wee hours of Friday, skywatchers across North America can see the moon turn red for the first time since 2022.