If the rays of the setting or rising sun hit the moon just right, the moon appears to turn red or ruddy-brown. This is called a blood moon.
The primary mission for NASA's Deep Space 1 was to test out a dozen new advanced technologies. During the spacecraft's ride through space, it also swung by an asteroid and a comet.
This Virgin Galactic spin-off aims to launch hundreds of small satellites into space at once, aboard their large LauncherOne rocket.
The small asteroid that broke up over the city of Chelyabinsk, Russia, on Feb. 15, 2013, was a reminder about the importance of monitoring small bodies in space that could pose a threat to Earth.
Elliptical galaxies are dim collections of older stars, so they don't shine as brightly as spiral galaxies but they're the most common type of galaxies in the universe.
NASA's Phoenix Mars Lander was a recycled spacecraft that became the first spacecraft to sample water on Mars.
Comet ISON, discovered by two amateur astronomers in Russia, arrived in Earth's neighborhood in November 2013 and apparently broke up as it rounded the sun.
For hundreds of years the Small Magellanic Cloud has provided astronomers with a relatively close-up view of another galaxy.
A black dwarf is all that is left after a white dwarf star burns off all of its heat, but retains its mass.
Richard Branson, through his company Virgin Galactic, plans to offer flights into space for paying customers by 2015.
Parallax is a method of measuring the distance to nearby objects in space. It is also a method used to display 3D images.
Voyager 2 is the only spacecraft to have visited all four giant outer planets in the solar system and is now the second spacecraft to reach interstellar space.
The Perseids meteor shower arises out of the debris of Comet Swift-Tuttle, which last made a pass by Earth in 1992.
The Quadrantids are a meteor shower in January that peak for only about six hours, are named for a constellation that no longer exists and come from an asteroid rather than a comet.
NASA's Kepler Space Telescope was revolutionary space telescope dedicated to finding planets outside our solar system.