Kuiper Belt, a disk-shaped region of space, extending beyond the orbit of Neptune, in which a very large number of minor planets are in orbit around the sun. These bodies, called Kuiper Belt objects (or trans-Neptunian objects), are generally less than 200 miles (320 km) in diameter, although some are larger. Quaoar, discovered in 2002, has a diameter of about 800 miles (1,300 km). Astronomers believe Kuiper Belt objects are composed of rock and ice and that some become comets. The discovery in 1992 of the object named 1992 QB1 provided the first observational evidence for the existence of the Kuiper Belt. The region is named after astronomer Gerard Kuiper, who theorized about distant objects in the solar system.
Hundred of meteors fly across the sky every night, but only a few make it to Earth. Meteors are best known for the brilliant streaks of light they make as they burn up in the atmosphere. Learn about 10 memorable meteor crashes that left an impression.
Scientists have discovered the existence of water on both our moon and on Mars. Both findings are significant, but what do they mean? Can we use this information to our advantage for space exploration?