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1919
Age of Universe: Infinate
Size of Universe: 300,000 Light Years
Eistein's Theory of General Relativity: Gravity would bend starlight as it passed the sun (2x faster than Newton's theory). A solar eclipse was needed to confirm this.
Observations of Milky Way: According to Dr. Shapely, the center of the Milky Way is 60,000 light years from the Sun, and 300,000 light years across
-Einstein added a cosmological constant to his equation to keep the universe unchangable -
1929
Age: 2 billion years
Size: 280 million light years
- Dr. Hubble discovered the distance to each nebulae. He found that Andromeda was 900,000 light years away, which proved it was outside the Milky Way
-Hubble identified the spiral, eliptical, and irregular galaxies
-Dr. Hubble proved that the universe is expanding -
1955
Age: 6 Billion Years
Size: 4-8 Billion Lightyears
-Walter Baade used the hooker telescope at Mt. Wilson Observatory to take images of Andromeda
-Type 1 stars are brighter, bluer and lie in open clusters
-Type 2 stars are redder, fainter, and lie in globular clusters -
1965
Age: 10-25 Billion Years
Size: 25 Billion Lightyears
-Three scientists who missed the CMB radiation in their data are Amile LaRox, AndreiDoroshkerik, and Edward Ohm
- Scientists measure the speed of stars around their center of gravity by studying light and the shift to light in nearby stars
-Arno Peazias and Robert Wilson discovered CMB radiation -
1993
Age: 12-20 Billion Years
Size: 30 Billion Light Years
-The universe started as a dense ball of energy that began to expand, distributing hot radiations.
-Two standar candles astronomers use are type 1a and Cepheid Variable.
-If dark matter was not present in ROSAT, gas would dissipate. -
2006
Age: 13.7 Billion Years
Size: 94 Billion Light Years
-Our universe is comprised of 73% dark energy, 4% normal matter, and 23% dark matter.
-John C. Mather won the 2006 Nobel Prize for his 1992 discoveries about CMB
-CMB stands for Cosmic Microwave Background
