A so-called "planet parade" is here—and it's about to shake up everything ... and Neptune—are aligning due to where they are in their orbits. The planets all move around the sun at different ...

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 ...

This means that objects in small orbits travel faster than objects in large orbits. The graph shows how the orbital speed of a planet changes with its distance from the Sun. Polar orbits take the ...