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

Researchers have peered into the atmosphere of planet WASP-121b and found its climate is stranger than anyone imagined.

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 ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – here’s how to spot the celestial show ...