Not that it was a competition, but Saturn surpassed Jupiter in known moons a few years ago. Now the giant planet may never ...

After Friday's spectacle, a "planet parade" of this size won't appear in the night sky for several years, experts say.

The planets are not exactly lined up ... "These are huge alignments across the scale of the universe," says Christiansen. They are used by telescopes such as the James Webb Space Telescope ...

Another finding was how dramatically the planets varied in brightness over just three years. The team discovered that PDS 70 ...

Mercury is joining Venus, Mars, Jupiter, Saturn, Uranus, and Neptune for a seven-planet parade. It's a stargazer's paradise.

While all seven planets could appear in some form in parts of the U.S., not all of them will be visible to the naked eye. Here's what to know.

Observers could see up to seven planets line up in the sky after sunset on Friday, but you may need a telescope to see them ...

According to Gerard van Belle, director of science at Lowell Observatory in Arizona, an alignment of seven planets is neither mystical nor particularly rare. “On the scale of supermoon to death ...