The red hue appears because the only sunlight reaching the moon passes through Earth’s atmosphere, according to NASA.
“The more dust or clouds in Earth’s atmosphere during the eclipse, the redder the Moon will appear,” the space agency wrote on its website. “It’s as if all the world’s sunrises and sunsets are projected onto the Moon.”
The May full moon is sometimes known as the “flower moon” in traditional folklore because it’s typically at a time of year when spring flowers emerge.
NASA featured livestreams of the eclipse from locations across the globe, including in Alabama, Italy, Spain and New York. Scientists also answered questions on the live feed. From beginning to end, the eclipse lasted just over five hours.