A NASA orbiter shows that lava may have flowed on the moon within the last 100 million years.
The moon, our companion in space, bears the scars of ancient asteroid impacts and lava flows. Such flows resulted in the large, dark spots on the moon’s surface that we see today. Scientists thought the moon's last volcanoes erupted at least 1 billion years ago. But new observations by NASA's Lunar Reconnaissance Orbiter (LRO) spacecraft have revealed dozens of geologic structures, called irregular mare patches, scattered across the lunar landscape. In these unusual areas, averaging 500 meters in diameter, smooth mounds sit next to blocky terrain. Unlike the rest of the moon, the structures have almost no craters, suggesting that they’re the remnants of recent lava flows that occurred within the last 100 million years. If true, this means the moon could be hotter inside than expected. Watch the video to learn more.