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Age: Infinite
Size: 300,000 ly -
-Einstein added the cosmological constant to keep the Universe unchangeable. It solved the problem of requiring the Universe to be either expanding or contracting.
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Scientists needed a total solar eclipse to detect the bending of starlight around the sun because they would need to see the most stars around it.
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Dr. Shapley's observations show that the center of the Milky Way is 60,000 light years from the sun, and the Milky Way is 300,000 light years across.
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Age- 2 billion years
Size- 280 Million light years -
Hubble identified three types of galaxies:
-Spiral
-Eliptical
-Irregular -
Dr. Hubble took photos of "spiral nebulae" with the Hooker Telescope.
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Hubble found that Andromeda was 900,000 light years away, showing that it lies outside the Milky Way.
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Age: 6 billion ly
Size: 4-8 billion -
Walter Baade also used the Hooker Telescope at the Mount Wilson Observatory to take images of Andromeda.
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Baade found two types of stars.
Type 1 are bluer, brighter, and lie in open clusters.
Type 2 are fainter, redder, and lie in globular clusters. -
Two theories from the origin of the Universe in 1955 and The Big Bang Theory and Steady State Theory.
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Age: 10-25 billion
Size: 25 billion -
Both Robert Wilson and Arno Penzias were trying to track down unwanted microwaves signals they were detecting witht the 20-foot horn-antenna in Holmdel.
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Andrei Doroshkeie, Edward Ohm, and Emile LeRox were three scientists who missed the cosmic background radiation in their data.
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Astronomers measure the speed of stars around the center of the gravity by studying the shift of light by stars.
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Both Russell A. Hulse and Joseph H. Taylor were very significant people around this time.
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Age: 12-20 billion
Size: 30 billion ly -
The Universe is a dense ball of energy that began to expand. it distributed hot radiation and space outward in all directions.
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If dark matter was not present, the gas would quickly dissipate.
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Age: 13.7 billion years
Size: 94 billion light years -
John C. Mather is a NASA scientist who was the Noble Prize in Physics.
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The Universe is 73% dark energy, 4% atoms, and 23% dark matter.
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CMB stands for Cosmic Microwave and Background.
