Galaxies and the Universe
Physics ⇒ Earth and Space Physics
Galaxies and the Universe starts at 9 and continues till grade 12.
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See sample questions for grade 12
A galaxy is observed to have a redshift corresponding to a recessional velocity of 21,000 km/s. If Hubble's constant is 70 km/s/Mpc, calculate its approximate distance from Earth in megaparsecs (Mpc).
Describe the difference between dark matter and dark energy.
Describe the main difference between elliptical and spiral galaxies.
Describe what is meant by the term 'look-back time' in astronomy.
Explain what is meant by the term 'cosmic microwave background radiation'.
Explain why the night sky is dark, even though there are billions of stars in the universe (Olbers' Paradox).
If a galaxy is 10 Mpc away from Earth, and Hubble's constant is 70 km/s/Mpc, what is its expected recessional velocity?
Name the galaxy that is closest to the Milky Way.
The redshift of light from distant galaxies is evidence for which phenomenon?
What is the approximate diameter of the Milky Way galaxy in light-years?
What is the main evidence for the existence of dark matter in galaxies?
What is the name of the theory that describes the origin of the universe from a singular point?
