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dwarf planets

Dwarf Planets
Image: NASA

Dwarf Planets

Dwarf planets have been in the news since Pluto received a demotion in 2006. Scientists think there are more than 200 dwarf planets, although only 5 have been verified.

Discover the features of a dwarf planet, but don’t give up on Pluto. Many scientists believe it should be bumped back up to full planet status!

NASA
New Horizons

New Horizons

In 2006, NASA launched the New Horizons Pluto–Kuiper Belt Mission. Explore the goals of this mission that is traveling to Pluto and beyond in the icy realm of the Kuiper Belt. More...

Article
NASA
Pluto’s Secret

Pluto’s Secret

In order to survive on Pluto, you need oxygen. In this game, your goal is to gather as much oxygen as possible. After the animation, select the planet Earth to start. More...

Game
National Geographic
Dawn Prepares for Trek Toward Dwarf Planet

Dawn Prepares for Trek Toward Dwarf Planet

NASA's Dawn spacecraft has come and gone from the asteroid Vesta and is on target to visit dwarf planet Ceres. Find out more about the mission. More...

Video
NASA
Is Pluto a Planet? The Votes Are In

Is Pluto a Planet? The Votes Are In

Many scientists and members of the public think that Pluto’s demotion to dwarf planet was a mistake. Things are looking up for the ex-planet... More...

Article
Harvard-Smithsonian Center for Astrophysics
Alan Stern: Principal Investigator, New Horizons

Alan Stern: Principal Investigator, New Horizons

Alan Stern's work on the New Horizons mission has taken him to interesting places. Find out why this scientist is strapped into the ejection seat of the F/A-18 Hornet jet. More...

Profile
NASA
Dwarf Planets

Dwarf Planets

What makes Pluto a dwarf planet and not an actual planet? Find out more about this mysterious object that sits at the edge of our solar system and its kin. More...

Interactive
National Geographic
Dwarf Planets Defined

Dwarf Planets Defined

How do scientists determine what is, and is not, a planet? How many dwarf planets are there? Get the answers here. More...

Article
Windows to the Universe
Dwarf Planets Quiz

Dwarf Planets Quiz

Dwarf planets received a lot of publicity after Pluto was reclassified, but how much do you know about these small worlds? Test yourself with this quiz. More...

Interactive
Solar System Quick
Pluto, You Have a Twin!

Pluto, You Have a Twin!

The dwarf planet Eris was once thought to be larger than Pluto, but now scientists believe it is almost a perfect twin. Discover how measurements of distant space objects can be made. More...

Video
Space.com
Science and Facts About the Solar System’s Smaller Worlds

Science and Facts About the Solar System’s Smaller Worlds

Astronomers think there could be as many as 200 dwarf planets in the solar system, but right now there are 5 “certified” ones. Meet Pluto, Ceres, Eris, Haumea, and Makemake. More...

Article
Space.com

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