This star is at the center of our solar system.

This kind of space propulsion technology, currently in development by NASA, provides the means for the United Federation of planets to explore the galaxy.

This stellar remnant, left over after a massive supernova explosion, has such a strong gravitational pull that even light cannot escape once it ventures close enough.

He was the first man to step on the surface of the moon.

This constellation, Latin for "Great Bear," is home to the Big Dipper.

This shape in the sky, made of seven bright stars, is always visible in the northern hemisphere and points the way to the North Star, Polaris.

In the film "2001: A Space Odyssey," a mission was sent to this planet after a large black monolith is found on the moon.

This giant storm on the surface of Jupiter is big enough across to fit in almost three Earths.

This, roughly, is the fraction of Earth's gravity you would feel on the moon.

Look through this constellation and you'll see the nearest spiral galaxy to our Milky Way, a whopping 2.5 million light years across space.

When a star like our sun generates energy, it is fusing two hydrogen atoms into this new element.

This seminal science-fiction author of "Foundation" and "I, Robot," began his professional life as a member of the faculty at Boston University with a PhD in biochemistry.

This strange form of matter, invisible in the normal human spectrum, was originally posited to exist based on gravitational anomalies in the motions of stars and galaxies.

This large, flat, lunar plain was the landing site for Apollo 11.

According to myth, these two constellations representing a hunter and a scorpion are never in the sky simultaneously because the scorpion killed the hunter.

This star, in the constellation Orion, is the type of star known as a "red giant," but don't say its name three times.

This fictional space probe, sharing a name with a pair of real space probes, returned to Earth after being given intelligence and self-awareness in "Star Trek: The Motion Picture."

This moon of Saturn has cryovolcanoes that blast water ice thousands of kilometers into space.

The word "lunar" traces its origins to the Latin word "Luna." This ancient Greek goddess of the moon also sometimes shares her name with our satellite.

This Southern Hemisphere constellation serves to help sailors get their bearings much the same way the North Star helps in the north.

This incredibly massive, incredibly hot type of star can go supernova without warning--but there are only about 1000 of them in the entire Local Group of galaxies.

This Hugo Award winning science fiction novel is about an interstellar war that, due to relativistic time dilation, stretches for centuries.

This bizarre type of star was initially termed an "LGM" for "Little Green Man" thanks to the regular pulses of radio energy it gives off.

This is the name of the dark, sea-like areas of the moon's surface.

Technically speaking, the Big Dipper is not a constellation. It is instead one of these, defined as an informal grouping of stars not recognized as a constellation by the International Astronomical Union.