Even though humans have pondered the moon since the first of us looked skyward, there is still much we don't know about it.

At 4,000 miles long and 30–40 miles wide, the East African Rift (EAR) system is one of the geologic wonders of the world.

Though the volcano’s magma chambers could hold enough material for a caldera-forming event, none of them are likely to erupt soon.