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A moon is a planetary body that goes around another planetary body. Usually, this is one or more moons going around a planet, but it doesn’t have to be a planet. In Star Wars, the Death Star is not a moon because it isn’t a naturally occurring satellite: the International Space Station, the Juno spacecraft orbiting Jupiter, or any of the telecommunications satellites we rely on in low Earth orbit are satellites, but are not moons.
Humankind has known about them for thousands of years. Mercury, Venus, Mars, Jupiter and Saturn are all visible in the night sky with the unaided eye. As such, these planets have been known for thousands of years and there is no one person who can be credited with discovering these planets. These planets appear as bright objects that do not shimmer, like stars do.
What if there are intelligent lifeforms elsewhere in the universe? And what if all we need to do to find them is to listen to the right radio frequency at the right time?
Recent discoveries and news in aviation and space.
In its operation for over 25 years, NASA’s Chandra X-Ray Observatory has changed our understanding of the universe.
A preview of the U.S. National Science Foundation Discovering Our Universe gallery.
Using some of the world’s largest radio telescopes to scan the stars for signals astronomers have been listening for signs of extraterrestrial life.
What’s new in aviation and space. The latest on the search for Amelia Earhart’s Lockheed 10-E Electra.
For twenty years Mars Rovers and Orbiters have worked to unlock the secrets of the Red Planet. This excerpt from curator Matt Shindell's book For The Love of Mars tells the tale.
The Ingenuity prototype will join other robotic explorers on display at the National Air and Space Museum.