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History of astronomy - Assignment Example

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Among the sciences, astronomy is the oldest of all having begun thousands of years in the past. The ancient cultures had believes which locked them from advancing in astronomy (Shu, H. Frank, 46 ). For instance,…
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History of astronomy Astronomy refers to the study of objects far away from the world. Among the sciences, astronomyis the oldest of all having begun thousands of years in the past. The ancient cultures had believes which locked them from advancing in astronomy (Shu, H. Frank, 46 ). For instance, among the Egyptians who were polytheistic there astronomy did not become anybody’s concern. People just left the subject of the cosmos because they thought the universe was under the control of gods. The Jews were the only people worshipping one God and made a predictable universe. The coming of the bible, which was associated with the Jews, made a great impact in science.
According to many, Greeks were the first people to know much of their surroundings before other cultures. It is the work of the Romans spreading the Greek philosophy, which made Greek work known by many.
Famous personalities that contributed to the science of astronomy include Pythagoras, Aristotle, Aristarchus, Erastosthenes, Ptolemy, Galileo, Kepler and Isaac Newton amongst others. Modern astronomy began about 1300 AD in Europe.
Almost all galaxies appear to be moving away from the world according to Edwin Hubble. Hubble came up with a constant he named hubble’s constant which is given by
H = v/d, where v stands for radial outward velocity and d is the distance of the galaxy from the earth.
Exercise #4
1. Speed of recession of galaxies
Galaxy
Speed of recession, V (km/s)
NGC 5746
1700
NGC 4976
1000
NGC 1023
800
NGC 5283
26000
NGC 2403
490
2. A graph of speed against distance
a. Taking the hubble constant as 50Km/sec/Mpc
Speed (km/s)
Distance (km)
1700
1100
1000
700
800
350
26000
3250
490
250
Scale y-axis 1 cm represents 5000km/s and for x-axis 1 cm represents 500 km
b. the line of best fit does not pass through all the points because the velocity of recession does not increase uniformly.
3. Hubbles constant = change in velocity/change in distance
Taking the origin and point (750,5000), the constant equals to 5000-0/500-0
5000/750 = 6.67
4. Two quasars
Redshift 0.5= 140000 km/s
Redshift 0.6 = 150000 km/s
5. Quasar 0.5 redshift=1700Mpc
Quasar 0.6 redshift = 1800Mpc
6. Distances
0.5redshift quasar is 1700×3.26×1000 =5542000 light years
0.6 redshift quasar is 1888×3.26×1000 =5868000 light years
7. Using the lower limit
V= D×H, v=300000000m/s or 300000km/s
Thus 300000km/s= D × 50Km/s/Mpc
D=6000Mpc, 6000×3.26= 19560×1000= 19560000 light years
Using the upper limit of H
300000km/s= D × 100km/s/Mpc
D = 3000Mpc, 3000 × 3.26×1000= 9780000 light years

Work Cited
Shu, H. Frank. “The physical universe: an introduction to astronomy”. University Science, 2002. Print. Read More
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