What key observation led Hubble to conclude that the universe is expanding? a) the distribution of...
What key observation led Hubble to conclude that the universe is expanding?
a) the distribution of the galaxies in the universe
b) the ratio of hydrogen to helium in a galaxy
c) the classification of different types of galaxies
d) the redshift of light from distant galaxies
Homework Answers
Ans)
Hubble observed that the red shift of galaxies was directly proportional to the distance of the galaxy from earth. Which meant that things which were farther away from Earth were moving away faster. That was the proof that the universe must be expanding. He postulated it in 1929. The ratio of distance to redshift was 170 kilometers/second per light year of distance, which is now called Hubble's constant. Hubble's discovery is one of the most important event in astronomy.
So, key observation let Hubble to conclude that the universe is expanding is:
d) the redshift of light from distant galaxies
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What key observation led Hubble to conclude that the
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I want an answer before Monday.
2. Mass versus Light One of the primary goals of every galaxy survey is to measure the distribution of the luminosities of galaxies, which has been found to be well parameterized by the luminosity function L/L- where φ(L)dL is the number density of galaxies with luminosity between L and L + dL, and φ*, L*, and a are parameters to be determined from galaxy surveys (a) Show that the luminosity density of galaxies, J,...
The Hubble Parameter
The constant describing the rate of this recession, called the
Hubble parameterHubble parameterA measure of the rate of expansion
of the universe, which is the average value of the velocity of
recession divided by distance: about 70 km/s/megaparsec. Hubble
parameter A measure of the rate of expansion of the universe, which
is the average value of the velocity of recession divided by
distance: about 70 km/s/megaparsec. , is used to determine the age
and size of the...
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I want an answer before Monday.
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