Each evening, enjoy a sweeping view of four planets at once. Also look for Mars occulted by the Moon and meteors!

Like bright comets, dark comets follow elongated, elliptical paths that bring them close to the sun before sweeping back out to the farthest reaches of the solar system. They go beyond Pluto ...

NASA's record-setting spacecraft was just 3.8 million miles from the sun's surface—the closest any human-made object has ever ...