Part 1: As you see, when the velocities of galaxies are plotted against the corr

Question

Part 1: As you see, when the velocities of galaxies are plotted against the corresponding distances, a straight line appears, an outcome that astronomers named Hubble’s Law. Express Hubble’s law in words, starting with the phrase, “The farther a galaxy is from us…”

Part 2: The expansion rate of the universe, called Hubble constant, is determined by computing the slope of Hubble law.

Slope=Velocit of Hydra- Velocity of Virgo/distance of hydra-distance of Virgo

Slope=

What are the units for the slope?

Part 3: Compare your Answer with the Hubble constant Ho=70km/s/Mpc . Is the value you have found close to the accepted value of Hubble constant? If not, can you provide an explanation?

Part 4: To calculate the age of the Universe with your value for  follow the steps:

Find the inverse of your value Ho:

1/H0= (Mpc/(km/s))

Part 5: Multiply the inverse by 3.09x10^19 km/Mpc to cancel the distance unit.

Age= _____________________ (s)

Part 6,As you have the age of the universe in seconds, divide this number by the number of seconds in a year: 1 yr= 3.16 x10^7 s .

Age = _______________(yr)

Part 7: Use ratios to compare your age of the universe to the age of the Sun (= 5.0 x10^9 yr).

Part 8: Use ratios to compare your age of the universe to the age of Milky Way (=12.5x10^9 yr)

Part 9:The long-standing view of the universe before Edwin Hubble’s observations was that everything was standing still. Give a short explanation of how your analysis supports or refutes this claim.

Explanation / Answer

Part1. The farther a galaxy is, the faster it appears to be moving away.

Part2. Units of the slope of Hubble's law are kilometers per second per megaparsec and km/sec per million-light-years.

Part-3. The Hubble Constant of approximately 500 km/s/Mpc instead of the true value of approximately 71 km/s/Mpc. The actual rate of expansion of the Universe differs from Hubble's constant. This is mainly due to the presence of "dark matter" which comprises about 80% of the universe is excluded while calculating Hubble's constant.  Dark matter interacts more strongly with visible matter or radiation than once thought.

Part-4. 1/71 (Mpc/(km/s))

Part 5: 3.089x1019 s

Part 6: 3.086x1019/(71*3600*24*365.25) = 13.77 billion years

Part 7: 13.77 : 4.6 = 2.99 :1

Part 8 : 13.77 : 13.51 = 1.02 :1

Part 9: Edwin Hubble with his theory and observation showed that everything in the universe is moving to and from each other rather, the universe itself is expanding ever since its birth. Therefore, the long-standing earlier view of the static universe is not true.

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