Ursa Minor, or Little Bear, the constellation of the northern sky that contains the Little Dipper. Ursa Minor is the most northerly of all constellations. Its brightest starPolaris, or the North Staris within approximately one degree of the north celestial pole. Because of this, Polaris never sets in latitudes north of the Equator, and is therefore visible in the Northern Hemisphere sky on any clear night. The second and third brightest stars, forming the end of the Little Dipper's bowl, are called the Guardians of the Pole.
A look at the night sky at any time of year will reveal a faint band of light stretching across the sky -- our solar system's home, the Milky Way. How much do we really know about it?
Killer asteroids are all fun and games -- until they're headed for Earth. How do we stop cosmic hot potatoes from wiping out our planet?