New results from China’s Chang’e 5 lunar samples returned to Earth provide evidence for active volcanoes on the Moon as recently as 120 million years ago. Previously, scientists had thought that any activity with magma (molten rock) rising to the Moon’s surface ended billions of years ago.

Around 170,000 years ago, the Yellowstone Caldera — a supervolcano — produced a series of small eruptions in frequent pulses lasting roughly 100,000 years. Remnants from those eruptions can be found on the Earth’s surface today as volcanic rock. And those rocks contain critical clues about the interior of the supervolcano.