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Age and Size
Age: Infinite
Size: 300,000 light years -
Newton and Einstein's Theory
Both thought sun's gravity would bend starlight as it passed by the sun.
-Einstein thought that the effect would be twice that predicted by Newton; he was correct -
Observations of 1919
Used a 60 inch telescope at the Mount Wilson Observatory to observe globular clusters. -
Period: to
Cosmic Timeline
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Age and Size
Age: 2 billion years
Size: 280 million light years -
Hubble's Discovery
Hubble took photos of Spiral Nebulae using the Hooker Telescope. From these photos he was able to calculate the distance to each nebulae. -
Hubble's Discovery Cont.
Identified 3 galaxies
-Spiral
-Eliptical
-Irregular -
Age and Size
Age: 6 billion years
Size: 4-8 billion light years -
Walter Baade
Walter Baade used the Hooker telescope to identify two types of stars. -
Star Types
The two types of stars identified by Baade were:
-Type I stars; brighter, bluer, and lie in open clusters in Andromeda's disk
Type II stars; redder, fainter, and lie in globular clusters. -
Cosmic Background Radiation
Cosmic background radiation was discovered by Arno Penzias and Robert Wilson. -
Age and Size
Age: 10-25 billion years
Size: 25 billion light years -
Measuring the Speed of Stars
Scientists discovered in 1965, to measure the speed of stars they had to study the shift of light. -
Dark Matter
Dark matter is matter we cannot see, but that exerts gravity. -
Age and Size
Age: 12-20 billion years
Size: 30 billion light years -
Russel A. Hulse and Joseph H. Taylor
These scientist were significant in 1993. -
Composition of Our Universe
73% dark energy
4% normal matter
23% dark matter -
Dr. John C. Mather
John C. Mather was a NASA scientist who won the Nobel Peace Prize. -
Age and Size
Age: 13.7 billion years
Size: 94 billion light years
