Assessment 17 – Size and Age of the Universe

Assessment 17 – Size and Age of the Universe

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 I can explain how astronomers know that the universe is expanding and
how they determine the age of the universe.

An article from skyandtelescope.com talks about a new study of  3 quasars that suggest the universe is expanding faster than we thought.

This relates to our conceptual objective, I can explain how astronomers know that the universe is expanding and ow they determine the age of the universe. In class we discussed Edwin Hubble, how measured the velocities of galaxies and found that almost all galaxies are moving away from us. This is evidence that the universe is expanding. Hubble’s Law can be expressed as  v = H0D, where v= velocity, H0= Hubble’s constant, and D= distance.

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Here is a graph from our textbook that shows Hubble’s constant

The data from the quasars has found that Hubble’s constant is between 68.9 and 74.3 160 km/sec per mega-parsec, which could be higher than the current accepted value of Hubble’s law, which is about 71.


This article showed how hard it is to find Hubble’s constant. I had no idea that scientists are still trying to find the precise value for this constant. It is also interesting to find out that Hubble initially estimated that the constant was 160 km/sec.

Author: jakek

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