On the 95th anniversary of its discovery, Pluto remains one of the most beloved and enigmatic worlds in our solar system, ...

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

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

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

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 ...

And then he’d go back later and use the blink comparator to compare the photos ... that led to the discovery of Planet X. Pluto never really fit in with the other planets in the solar system.

Pluto failed the third criterion. Unlike the eight recognized planets, Pluto shares its orbit with many other objects in the Kuiper Belt, meaning it has not "cleared its neighbourhood." ...

The other four moons ... in the solar system compared with its parent body. In fact, Charon and Pluto are so similar in size that they are considered a double dwarf planet system, not a planet ...

Compare that with Earth’s Moon ... If a liquid water ocean is truly present inside Pluto, this puts the dwarf planet among ...

On the other hand, outer planets move very slowly, and we see their influence unfold over time.” She notes that to understand where Pluto is taking us, it’s helpful to look back at where we ...

Take advantage of a special 6-7 planet alignment from Earth's perspective. Planets 'line up' in the skies over California in ...