Multiple choice general knowledge science & technology

Besides ordinary matter, The Universe contains a lot of "Dark matter", which is an unknown substance. What fraction of the mass of The Universe is ordinary matter, like hydrogen and Helium

  1. 70-80 %

  2. 30-40 %

  3. 2-3 %

  4. 0-0.2 %
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ordinary (baryonic) matter makes up about 5% of the universe's total mass-energy content, with dark matter at ~27% and dark energy at ~68%. The 2-3% figure in option C is the closest approximation to the actual ~5% baryonic matter fraction.

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