Explore the 25 strangest scientific theories ever proposed, from phlogiston to the hollow Earth. Discover how bizarre ideas ...

Jupiter goes around its star in 180 days, which is a long time compared with most exoplanets we've discovered.

NASA has confirmed 6,000 exoplanets, marking a major milestone in humanity’s quest to understand other worlds. From gas giants hugging their stars to planets covered in lava or clouds of gemstones, ...

NASA's Juno mission has provided the first measurements of the temperature below the surface of Jupiter's moon Io, revealing ...

NASA’s Juno spacecraft has forced planetary scientists to reconsider something they thought was settled: how big Jupiter actually is. New measurements show the solar system’s largest planet is ...