Are you a space whiz? Take our quiz!

How much do you know about astronauts, meteorites, planets, stars, and galaxies?

4. Which is the correct order of planets, starting with the planet closest to the sun?

Pluto is no longer a planet. On August 24, 2006, the International Astronomical Union (IAU) defined the term "planet" for our Solar System. This definition excluded Pluto as a planet and made it the largest member of the new category "dwarf planet," along with Eris and Ceres.

Pluto is no longer a planet. On August 24, 2006, the International Astronomical Union (IAU) defined the term "planet" for our Solar System. This definition excluded Pluto as a planet and made it the largest member of the new category "dwarf planet," along with Eris and Ceres.

Pluto is no longer a planet. On August 24, 2006, the International Astronomical Union (IAU) defined the term "planet" for our Solar System. This definition excluded Pluto as a planet and made it the largest member of the new category "dwarf planet," along with Eris and Ceres.

Pluto is no longer a planet. On August 24, 2006, the International Astronomical Union (IAU) defined the term "planet" for our Solar System. This definition excluded Pluto as a planet and made it the largest member of the new category "dwarf planet," along with Eris and Ceres.

John Green & The ULAO Project
(Read caption)

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

 

Mars, Venus, Earth, Mercury, Jupiter, Saturn, Uranus, Neptune

 

Mars, Venus, Earth, Mercury, Jupiter, Saturn, Neptune, Uranus, Pluto

 

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto

 
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