One of the biggest advances of the 20th century has been to identify exactly how rich, expansive, and massive our Universe actually is. With approximately two trillion galaxies contained in a volume some
The Night Sky in January 2016: Phobos, the larger of the two Martian moons, is on a path to destruction Phobos. It means fear. With a seven-mile diameter, it is the innermost and biggest moon of Mars.