The mysterious Oort cloud is the source of many of our solar system's comets, but astronomers still have no idea what it ...

Ahead of its dance with Saturn on Feb. 24, Mercury should be seen on Feb. 19 at magnitude -1.2 with binoculars 20 minutes ...

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

Find Tidal Forces Latest News, Videos & Pictures on Tidal Forces and see latest updates, news, information from NDTV.COM.

Hidden ice? NASA’s Lunar Trailblazer will reveal where the Moon’s water really is 'Earth will flip': A 42,000-year-old tree ...