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

And being so close to the sun, it will be difficult to see. With eight planets in our solar system, they all have some very interesting traits. Here's a quick look at the planets aligning on this ...

possibly eight times the mass of Jupiter, may have significantly altered the orbits of the four outer planets in our solar system. This encounter, occurring billions of years ago, could explain ...