Extreme Space Facts Quiz

A rapid‑fire set of nine challenging questions about the universe's most astonishing phenomena.

hard quizplanetary scienceorbital mechanicsnebulaespaceastronomygalaxystellar knowledgecosmic facts
Difficulty:HARD

Quiz Details

Questions9
CategoryFun Facts
DifficultyHARD
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Quiz Questions

Answer all questions below and test your knowledge.

  1. 1

    Which natural satellite possesses the deepest confirmed impact basin, named South Pole‑Aitken?

    Question 1
  2. 2

    What is the approximate orbital period of the dwarf planet Eris around the Sun, in Earth years?

    Question 2
  3. 3

    Which exoplanet, discovered in 2022, holds the record for the highest measured surface temperature exceeding 4,000 K?

    Question 3
  4. 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?

    Question 4
  5. 5

    Which galaxy, located about 2.5 million light‑years away, is the nearest large spiral galaxy to the Milky Way?

    Question 5
  6. 6

    What is the name of the region on the Sun where magnetic field lines reconnect, releasing massive amounts of energy as solar flares?

    Question 6
  7. 7

    Which mission, launched in 2021, became the first spacecraft to orbit an interstellar object, 'Oumuamua?

    Question 7
  8. 8

    How many known moons does Saturn have as of November 14, 2025?

    Question 8
  9. 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?

    Question 9

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