Question 1

True or false: Pluto takes about 248 Earth years to complete one orbit around the Sun.

Accepted Answer

True. Pluto’s highly elliptical orbit lasts 248 Earth years. It was discovered in 1930 and hasn't completed a full orbit since.

Question 2

True or false: Pluto was discovered by astronomer Clyde Tombaugh in 1930 using a simple backyard telescope.

Accepted Answer

False. Tombaugh discovered Pluto at Lowell Observatory using a 13-inch astrograph, not a simple backyard telescope.

Question 3

True or false: Pluto’s orbit sometimes brings it closer to the Sun than Neptune.

Accepted Answer

True. For about 20 years of its 248-year orbit, Pluto is inside Neptune’s orbit. They never collide due to orbital resonance.

Question 4

True or false: Pluto was demoted to dwarf planet because it has no atmosphere.

Accepted Answer

False. Pluto actually has a thin atmosphere of nitrogen and methane. It was reclassified because it hasn't cleared its orbital neighborhood.

Question 5

True or false: Pluto is the largest object in the Kuiper Belt.

Accepted Answer

True. Pluto is the largest known dwarf planet in the Kuiper Belt, just slightly larger than Eris, which was once thought to be bigger.

Question 6

True or false: Pluto has five moons, but only Charon was discovered before the 21st century.

Accepted Answer

False. Charon was discovered in 1978. The other four moons—Styx, Nix, Kerberos, and Hydra—were found later by the Hubble Space Telescope.

Question 7

True or false: Pluto’s largest moon, Charon, is so big that Pluto and Charon orbit a point outside Pluto.

Accepted Answer

True. Charon is about half Pluto's size. Their barycenter lies above Pluto’s surface, making them a binary system.

Question 8

True or false: Pluto has a subsurface ocean of liquid water beneath its icy crust.

Accepted Answer

True. Data from New Horizons suggests a liquid water ocean exists under Pluto's ice, kept warm by radioactive decay and tidal forces.

Pluto (dwarf planet) Trivia Questions