In the bigger picture, "down" could be defined as being below the plane of the solar system, which is known as the ecliptic.

Every year in early January, Earth reaches the closest point in its orbit to the Sun, a moment astronomers call perihelion.

An annexation of Greenland would be the largest geographic acquisition in U.S. history—but financial rewards would be a long ...

Utah researchers have confirmed that a tiny roundworm, unknown to science until now, is thriving in the Great Salt Lake, one ...

At 4:56 a.m. EST (0956 GMT) on Feb. 17, the moon will begin to turn the sun into an impressive "ring of fire" during an ...