Solar system trivia

8 solar system trivia questions, from easy to hard. Tap a question to see the answer. They're real questions from Rubicon, where you type the answer yourself and an AI judge reads what you meant.

This set covers Asteroids, Comets & Impacts, Gas & Ice Giants, Origin of the Solar System, Our Sun and Planets & Moons.

Questions and answers

  1. Easy Why do millions of asteroids remain clustered between Mars and Jupiter?

    They are leftover building blocks from the early solar system that never accreted into a planet due to Jupiter's gravity.

  2. Easy Which major planet do the four famous Galilean moons orbit?

    The four Galilean moons orbit Jupiter, the largest planet in our solar system.

  3. Easy Why does the reddish outer layer of the Sun only appear during a total eclipse?

    The Sun's blinding bright surface usually overpowers this faint layer until the Moon covers it.

  4. Medium Why did rocky worlds form near the early Sun while massive gas giants grew much farther away?

    Beyond the frost line, freezing temperatures allowed abundant hydrogen compounds to form solid building blocks.

  5. Medium What did the massive 1908 Tunguska explosion flatten across hundreds of square miles without producing an impact crater?

    The atmospheric blast flattened tens of millions of forest trees across a vast area of Siberian taiga.

  6. Medium How was the Huygens probe able to safely slow down and touch down onto Titan's surface?

    Huygens relied on a heat shield followed by a series of parachutes to float down through the dense atmosphere.

  7. Hard Io is tiny and frozen in deep space, yet it is covered in active volcanoes. What physical mechanism constantly generates its internal heat?

    Jupiter and neighboring moons continuously pull and flex Io into changing shapes, creating massive internal friction that melts its rock.

  8. Hard Why will running out of core hydrogen cause the Sun to expand dramatically instead of simply shrinking and cooling down?

    The core collapses and heats up, igniting hydrogen in the surrounding shell whose intense radiation pushes outer layers outward.

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