Extreme Space Facts Quiz
A rapid‑fire set of nine challenging questions about the universe's most astonishing phenomena.
Quiz Questions
Answer all questions below and test your knowledge.
- 1
Which natural satellite possesses the deepest confirmed impact basin, named South Pole‑Aitken?
- 2
What is the approximate orbital period of the dwarf planet Eris around the Sun, in Earth years?
- 3
Which exoplanet, discovered in 2022, holds the record for the highest measured surface temperature exceeding 4,000 K?
- 4
What type of celestial object is responsible for the periodic brightening known as a microlensing event when it passes in front of a background star?
- 5
Which galaxy, located about 2.5 million light‑years away, is the nearest large spiral galaxy to the Milky Way?
- 6
What is the name of the region on the Sun where magnetic field lines reconnect, releasing massive amounts of energy as solar flares?
- 7
Which mission, launched in 2021, became the first spacecraft to orbit an interstellar object, 'Oumuamua?
- 8
How many known moons does Saturn have as of November 14, 2025?
- 9
What is the theoretical minimum mass, in Earth masses, for a planet to sustain a hydrogen‑helium envelope and be classified as a mini‑Neptune?
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