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.

Saturn, Venus, Neptune, Uranus, Jupiter, Mars and Mercury will be visible in an uncommon planetary alignment this month.

Pluto may not be a planet any more, but you still have a chance to see the distant dwarf planet at one of Michigan's ...

Scientists have mapped the atmosphere a planet outside of our solar system in 3D for the first ever time. And they have found ...

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

"It feels like something out of science fiction," said European Southern Observatory astrophysicist Julia Victoria Seidel.

Planet demographics reveal a puzzling lack of worlds in a certain size range throughout the galaxy F or centuries our solar system was the only planetary system known to humans. We had no proof other ...

Feb. 18 marks the 95th anniversary of the discovery of our outermost planet-not-planet. Here's what to know about the short ...

Pluto was once the ninth planet of our solar system, until scientists reclassified it in 2006, sparking outrage and debate.