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

Here’s what you should know when you go outside to see for yourself: Yes, the planets are indeed lined up across our sky. No, ...

Six planets are parading across the sky, appearing as some of the night's brightest stars. A few easy tips can help you identify them.

All of our solar system’s planets are lining up to parade through the night sky at once. This extraordinary celestial event will see the sky scattered with seven visible planets in what is known ...

The night sky will offer stargazers a special sight for the next several weeks: Right now, all planets except Mercury can be seen after sundown—then, in late February, the missing planet will join the ...