Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

Alignments of five or more planets are rare—there will be two more featuring five or more planets this year, but after that ...

In fact, according to the stargazing website EarthSky, a perfect straight-line alignment of all the planets will probably never happen. Rather, since the planets all orbit along or near the plane ...

Shimpei Yamashita via Getty Images 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 ...

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 ...

This is colloquially referred to as a “planetary parade,” or a “parade of planets,” but these are not astronomy terms used to describe the event, according to NASA. All planets revolve ...