Question 1

True or false: Sedna is named after the Inuit goddess of the sea, who created marine animals.

Accepted Answer

True. Yes, Sedna is the Inuit sea goddess; the naming honors Indigenous culture and fits the icy, ocean-themed dwarf planet.

Question 2

True or false: Sedna was discovered in 2015 by the New Horizons spacecraft.

Accepted Answer

False. Sedna was discovered in 2003 by astronomers Brown, Trujillo, and Rabinowitz using the Palomar Observatory, not by New Horizons.

Question 3

True or false: Sedna is the most distant known dwarf planet in our solar system, even farther than Pluto.

Accepted Answer

True. Sedna's highly elliptical orbit takes it far beyond the Kuiper Belt, with an aphelion around 900 AU, making it one of the most remote objects.

Question 4

True or false: Sedna is smaller than Pluto but larger than Ceres.

Accepted Answer

False. Sedna is estimated at about 1,000 km in diameter, smaller than Pluto (2,377 km) and also smaller than Ceres (940 km).

Question 5

True or false: Sedna's surface is one of the reddest in the solar system, similar to Mars.

Accepted Answer

True. Sedna's surface is extremely red, likely from tholins—organic compounds created by radiation—giving it a Mars-like hue.

Question 6

True or false: Sedna has a confirmed moon, named Sednara, discovered in 2004.

Accepted Answer

False. Sedna has no confirmed moon; the name 'Sednara' is fictional. No satellite has been detected around it as of now.

Question 7

True or false: Sedna takes about 11,400 years to complete one orbit around the Sun.

Accepted Answer

True. Its extreme orbit takes roughly 11,400 years due to its massive distance, making it one of the longest orbital periods known.

Question 8

True or false: Sedna was once a moon of Neptune that got ejected into a distant orbit.

Accepted Answer

False. Sedna's orbit is too distant and eccentric for a Neptunian origin; it likely originated from the inner Oort Cloud.

Sedna Trivia Questions