Data from the James Webb Space Telescope and other observatories suggests a supervolcanic exomoon may lurk around the giant ...

It was meant to be the trip of a lifetime, a guided tour to a beautiful volcanic island surrounded by the sea. But in an instant, paradise turned to chaos when the volcano erupted without warning.

How do volcanoes work? What happens beneath their surface? What causes the vibrations—known as tremor—that occur when magma ...