Scientists have discovered an anomalous blob of heat on the far side of the moon.
This mysterious hotspot has a strange origin: It’s likely caused by the natural radiation emanating from a huge buried mass of granite, which is rarely found in large quantities outside of Earth, according to new research. On the moon, a dead volcano that hasn’t erupted for 3.5 billion years is likely the source of this unusual hunk of granite.
The moon is hypothesized to be made of material from when Theia (hypothetically) struck Earth billions of years ago. Most of the matter became the Earth and some spun out into space and became the moon.