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.
How would you measure the masses of objects as big as stars, galaxies and black holes? With solar mass. And you can thank Sir Isaac Newton for that.
The Large Magellanic Cloud (LMC) is a satellite dwarf galaxy that is among the closest galaxies to Earth.
Nibiru has been linked to NASA, and is also sometimes referred to or confused with Planet X, another supposed world for which there is no evidence.
NASA's next lander, InSight, will study the interior structure of Mars for signs of tectonic activity.
A spiral galaxy has a distinct winding shape. Most of the galaxies observed by astronomers are spiral galaxies.