An amateur astronomer discovered Pluto 95 years ago today. The former planet will complete an orbit in another 153 years.

The controversy endures over Pluto's true status, but the solar system underdog continues to capture hearts across the globe.

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary status.

“New Horizons shattered a major paradigm of planetary science,” says Alan Stern, the mission’s principal investigator. “Pluto ...

On today’s date 95 years ago, everyone’s favorite not-quite-a-planet, Pluto, was discovered by astronomer Clyde W. Tombaugh ...

NASA’s Lunar Trailblazer will map the Moon’s water, using advanced instruments and gravity-assisted navigation to unlock vital resources for future space exploration.

You might think sex in space would be an out-of-this-world experience — but low-gravity intimacy may not be as much of a high as it sounds.

Why is Pluto no longer a planet? Discover the real reason behind Pluto’s reclassification as a dwarf planet and the science that led to this change.

According to a recent YouGov poll, 35% of Americans think Pluto is not a planet. But they are all wrong—kind of. To get to ...

This term includes theoretical studies of gravity, experimental studies of gravitational waves and observational studies of gravitational lensing, as well as tests of general relativity and ...

The cost of cable continues to rise, but streaming services aren't getting much cheaper, either. Before you pony up even more cash to subscribe to yet another platform, stop and consider all of ...

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