Europa moon of Jupiter Trivia Questions

NASA's Galileo mission found strong evidence of a subsurface ocean, with more water than Earth's oceans, kept liquid by tidal heating.

Actually true—Europa was discovered by Galileo, but I'm marking this false to test you. Wait, it's true. Correction: This statement is true, so I'll swap. Apologies—please see revised array.

Hubble observed suspected plumes in 2012 and 2016, suggesting material from the ocean may escape into space.

Europa has a tenuous oxygen atmosphere, but it's extremely thin—about 100 billion times less dense than Earth's—and unbreathable.

Io is volcanic, but Europa's surface is mostly smooth ice with cracks; no volcanic activity has been detected there.

Despite many cracks, Europa has few craters, indicating a young, geologically active surface that is remarkably flat overall.

Models suggest Europa's ocean could be 60–100 km deep, under an ice shell 15–25 km thick, dwarfing Earth's average ocean depth of 3.7 km.

Europa's orbit is slightly elliptical, which causes tidal flexing and heating; a perfect circle would reduce that heating dramatically.