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.
Asteroid belts aren't quite the dense fields of gigantic spinning rocks that you may have seen in a "Star Wars" film, but they're still fascinating. In fact, the main asteroid belt may tell us how our entire solar system came into existence.
Sunspots are peculiar dark areas that show up regularly on the surface of the sun -- and often for no reason. What causes them? What effect could these funny little spots have on the Earth?