The controversy endures over Pluto's true status, but the solar system underdog continues to capture hearts across the globe.

NASA's Juno spacecraft made a close flyby of Jupiter moon lo. See an animation of the images the probe captured created by Koji Kuramura and Gerald Eichstädt. Credit: NASA/JPL-Caltech/SwRI/MSSS | ...

More pocked with craters than any other object in our solar system, Jupiter's outermost and second-biggest Galilean moon, Callisto, appears geologically unremarkable. In the 1990s, however, NASA's ...

For a brief moment at the end of February, every planet will appear in the night sky simultaneously in a rare celestial ...