NASA spacecraft flew by distant world. It saw unprecedented volcanism.

On Dec. 27, 2024, NASA's Juno spacecraft swooped by the volcanic world Io. It witnessed a giant eruption.As the space agency's basketball court-sized craft orbits Jupiter, it swings near the gas giant's intriguing moons, which allowed Juno to observe "a massive hot spot" near Io's south pole. Juno's JIRAM instrument, which can detect heat, observed a number of closely spaced hot spots, pointing to a giant eruption of lava from a vast underground chamber."The data supports that this is the most i