Over the last ten years, OPAL has observed Uranus' northern hemisphere, which has faced the inner solar system for the ...

Encountering Neptune in 1989, NASA’s Voyager mission completed humankind’s first close-up exploration of the four giant outer ...

Surrounding Jupiter, trapped within the gigantic magnetic field generated by the planet, is the Io Plasma Torus — a donut-shaped ring of charged particles spewed out by the plentiful volcanoes ...

Much larger than the rocky planets, these cosmic giants are accompanied by numerous moons. Jupiter, famous for its red spot, is the largest, followed by Saturn with its rings made of ice ...

Explore the December sky with our guide to astronomy events, including planetary alignments, moon phases, and asteroid ...

Have you ever wished the Jupiter or Saturn were closer to Earth? Saturn’s rings would offer a more ... has calculated how big each planet would look in our sky if it replaced the moon.