“As maximum eclipse nears, the moon transforms into a deep crimson orb,” the space agency said. “That red color comes from the ring of all the sunsets and sunrises you’d see encircling our planet if you were an astronaut on the lunar surface right then.”

A lunar eclipse occurs when the sun, Earth, and moon align so that the moon passes into Earth's shadow. In a total lunar eclipse, the whole moon falls within the darkest part of Earth's shadow – called the umbra.