When did Pluto stop being a planet, and why? Pluto was always in a tough spot when it came to being a planet. Just 1,477 miles across, it's only one-fifth the diameter of Earth.

Pluto was the little planet that could — until it couldn’t. Discovered in 1930 at Lowell Observatory in Flagstaff, Arizona , Pluto was hailed as the ninth planet in our solar system.

Despite Pluto's reclassification as a dwarf planet, it continues to fascinate researchers and space observers around the world. A few reasons include that its orbit is elliptical and has a 17 ...

Pluto Has Company . For 76 years, Pluto was considered the ninth planet of our Solar System, 3.7 billion miles from the Sun. What's more, for the first 62 years following its discovery in 1930 ...

Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why Pluto isn't a planet.

The astronomers at Lowell Observatory in Arizona are showing Pluto some love on the 95th anniversary of its discovery, regardless of whether we call it a planet or not.

Pluto's demotion was partially caused by us getting better at spotting planets (or "dwarf planets," if you prefer). In the early 2000s, astronomers identified Haumea, Eris, Makemake, and other ...

What We've Learned About Pluto. We’ve learned a lot about poor, poor little Pluto — thanks to NASA’s New Horizons probe, which visited the dwarf planet in 2015.

Pluto, our petite power planet of primordial urges, transformation through trauma, ID energy and the subconscious mind, is going retrograde in Aquarius from May 4th to October 13th.

Earth has a newly-discovered neighbor in the solar system.. But the heavenly body – possibly a dwarf planet à la Pluto – isn't a frequent visitor. Located beyond Neptune, its extreme orbit ...