We've known for over 30 years that there are other stellar systems in our galaxy, but we don't have any idea how many there ...

So exactly how many solar system moons have we found ... "moonlets," also have "fuzzy definitions" and are not considered true moons, Gladman added. Even among recognized moons, there are still ...

Earth has a nearly circular orbit, but some planets outside our solar system, called exoplanets, have very elliptical orbits. UCLA astrophysicists have now measured the shape of the orbits of ...

Astronomers have sent artificial satellites (satellites that are manmade) to orbit several Solar System objects, including Jupiter, the asteroid Vesta and Mars. Polar orbits take the satellites ...