The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Finding a world like Earth elsewhere in the universe might mean looking for the right kind of solar system. A new discovery sheds light on what composition of planets might be necessary to support ...

It actually follows its own tiny elliptical orbit around what is called the center of gravity (the barycenter) of the system, the sun and the orbiting planets ... is to take images of the sun.

In our own solar system, the Kuiper Belt is a region of icy bodies, some of which fly through the inner solar system as comets, which languishes far from the sun at distances between 30 and 55 ...