Questions in this quiz: Uranus and Neptune

The ice giants. Uranus's sideways axial tilt, methane atmosphere, Miranda's chaotic terrain. Neptune's Great Dark Spot, supersonic winds, Triton's retrograde orbit, and Voyager 2's only flybys.

1. Voyager 2 made its closest approach to Neptune in August 1989. Approximately how long after launch did this flyby occur? — Options: About 6 years, About 9 years, About 12 years, About 15 years
2. Uranus's axis is tilted roughly 98 degrees from its orbital plane. What is the leading hypothesis for how this extreme tilt originated? — Options: Tidal locking with its largest moon Titania, A giant impact with an Earth-sized body in the early solar system, Resonant gravitational interaction with Neptune, Atmospheric drag during planetary migration
3. Miranda's surface features a roughly 20-kilometer-high cliff face, one of the tallest known in the solar system. What is this feature called? — Options: Ahuna Mons, Verona Rupes, Olympus Mons, Caloris Planitia
4. Neptune's winds are the fastest measured on any planet in the solar system. Roughly what peak wind speed did Voyager 2 record? — Options: 800 km/h, 1,500 km/h, 2,100 km/h, 3,400 km/h
5. Triton orbits Neptune in a retrograde direction. What does this strongly suggest about its origin? — Options: It formed in situ from Neptune's circumplanetary disk, It is a captured Kuiper Belt object, It is debris from a collision between Neptune and a protoplanet, It was ejected from Uranus's system during planetary migration
6. When the Hubble Space Telescope imaged Neptune in 1994, what had happened to the Great Dark Spot observed by Voyager 2? — Options: It had migrated to the southern polar region, It had grown to cover nearly half the planet's disk, It had disappeared entirely, It had split into two smaller spots
7. Triton's surface features active geyser-like plumes. What are these plumes believed to primarily eject? — Options: Liquid water, Molten silicate lava, Nitrogen gas with dark dust, Sulfur dioxide vapor