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The Hardest Quiz About The Sun You'll Take Today

Learnt a thing or two while watching the solar eclipse on Friday? Prove it here.

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  1. 1. Which part of the sun is hotter?

    It's atmosphere
    The surface
    Correct!
    Wrong!

    It's the solar corona – it's atmosphere – that's the hottest, weirdly. Scientists don't 100% know why.

  2. 2. How many Earths could fit inside the sun?

    (If you melted down the Earths.)

    13 million
    1.3 million
    Correct!
    Wrong!

    If you don't melt them, it'd be just under one million, with all the gaps between the Earths.

  3. 3. How long does it take a photon to get out from the centre of the sun?

    A few seconds.
    Thousands of years.
    Correct!
    Wrong!

    This paper puts it at 170,000 years for the average photon to escape the sun.

  4. 4. What proportion of the solar system does the sun make up, by mass?

    99%
    90%
    Correct!
    Wrong!

    Basically, Earth and all the other planets are insignificant next to it.

  5. 5. Who drew this diagram of sunspots?

    Galileo Galilei
    Isaac Newton
    Correct!
    Wrong!

    He did it in 1612!

  6. 6. Are sunspots hotter or cooler than the rest of the sun's surface?

    Hotter
    Cooler
    Correct!
    Wrong!

    That's why they look dark.

  7. 7. What colour is the sun as viewed outside of our atmosphere?

    White
    Yellow
    Correct!
    Wrong!

    It's #fff5f2 to be precise. Here's why it looks yellow to us (it's to do with scattering in the atmosphere).

  8. 8. When did the sun form?

    4.5 billion years ago
    6.5 billion years ago
    Correct!
    Wrong!

    It formed along with the solar system around 4.5 billion years ago.

  9. 9. How long until the sun is a red giant?

    1 billion years
    4.5 billion years
    Correct!
    Wrong!

    When it's around 7 billion years old, the sun's going to start expanding. When it reaches around 10 billion years old it'll have become a red giant whose atmosphere will reach almost as far as where Earth is right now. Eek.

  10. 10. What part of the sun is visible during a total eclipse?

    Corona
    Chromosphere
  11. 11. Which is the correct order for the inner layers of the sun?

    Core, Convection Zone, Radiative Zone .
    Core, Radiative Zone, Convection Zone.
    Correct!
    Wrong!

    This NASA diagram reveals all.

  12. 12. Which is the correct order for the outer layers of the sun?

    Transition Region, Photosphere, Chromosphere, Corona.
    Photosphere, Chromosphere, Transition Region, Corona.
    Correct!
    Wrong!

    Check this NASA diagram again for the outer layers too.

  13. 13. How long does the sun take to make one rotation on average?

    27 days
    72 days
    Correct!
    Wrong!

    Although the equator rotates faster than the poles, on average the sun rotates roughly once every 27 days.

  14. 14. How many times more massive than Earth is the sun?

    3,330
    333,000
    Correct!
    Wrong!

    That's 2 x 1024 kg.

  15. 15. What type of star is the sun?

    A G-type main sequence star
    A K-type main sequence star
    Correct!
    Wrong!

    It's a G – which means it had a temperature of around 6000 Kelvin.

The Hardest Quiz About The Sun You'll Take Today

Amazing!

Wow, you either really know your stuff or are good at guessing. Well done!

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Not bad!

You know some stuff about the sun! Not, like, everything, but that's fine, because nobody expects you to know everything.

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Oh dear!

That wasn't great. You would have probably done better if you just guessed at random – maybe try that next time.

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The sun's atmosphere is hotter than its surface. An earlier version of this quiz said that the sun's atmosphere was hotter than its core, which it clearly is not. You can all add one point to your scores, sorry!

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