The weather forecast for Jupiter calls for clouds with a chance of lightning and "mushballs"—a slushy mix of ammonia and water encased in a hard water ice shell that rain down like hail here on Earth.

WASHINGTON — Scientists studying Jupiter's weather for nearly 40 years made some unexpected and slightly mysterious discoveries about how temperatures in the planet's different belts and zones ...

The biggest planet in the solar system will be on display in the December sky as it shines brighter than it has all year. On Saturday, Dec. 7, Jupiter will reach opposition, the point in its orbit ...

Collaborative work by amateur and professional astronomers has helped to resolve a long-standing misunderstanding about the composition of Jupiter's clouds. Instead of being formed of ammonia ice—the ...