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Age and Size
Age: Infinite
Size: 300,000 light years -
Period: to
Cosmic Times Timeline Project
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Dr. Shapley's Observation of the Milky Way
Dr. Shapley found a common center of gravity that globular star clusters were orbiting. He used cepheid veriable stars to find the distance to the clusters. He dound out that the center of the Milky Way id 50 thousand ligh years form the sun and 300 thousand light years across. -
Einstein
Einstein's Theory of General Relativity predicted that gravfity would bend starlight as it passes by the sun. Professor Stanley Eddinton data from his observation during a total solar eclips proved Einstein's theory. -
Finding Stars Near the Sun
Scientists used a total solar eclipse th detect the bending of starlight around the sun so they could see the stars that are near the sun. -
Age And Size
Age: 2 Billion Years
Size: 280 Million Light Years -
Three Types of Galaxies
Hubble descovered three types of galaxies:
Spiral, Eliptical, Irregular. -
Dr. Hubble and Your Galaxy
Dr. Hubble took pictures of "spiral nebulae" which showed indicidual stars. He was able to calculate the distance to each nebulae. He found the Adromeda was 900 thousand ligh years away and that it was outside the Milky Way. -
Hubble's Discovery of Our Universe
He measured the red shift of several nebulae and found that they are all moving away. He started looking at the speed-distance relationship between galaxies. With this he showed tht the further a nebula is from us the faster it is moving away. He dicovered that the Universe is expanding. -
Age and Size
Age: 6 Billion Years
Size: 4-8 Billion Light Years -
Walter Baade
He found that there were two types of stars:
Type l stars which are bighter, bluer, and lie in open clusters in Andromeda's disk.
Type ll stars are fainter, reder, and lie in globular clusters. -
Theories
There were two theories for the origin of the Universe. The Big Bang therory and The Steady State theory. -
Super-novae
There are two types of super-novea. There are type l and type ll. Type l has oxygen while type ll doesnt. -
Age and Size
Age: 10-25 Billion Years
Size; 25 Billion Light Years -
Arno Penzias and Robert Wilson
They bpth ere trying to track down unwanted microwave signals they were detecting when they discovered cosmic background radiation. The radiation was coming from the hot, dense ball of matter and energy that existed at the begining of the Universe. -
Measuring the Speed of Stars
Asronomers measure the speed of stars around their center of gravity by studying the shift of light in stars. -
Galaxies Misbehaving
Astronomers found that the amount of light we see doesn't match what we would expect from that much matter. -
Age and Size
Age: 12-20 Billion Years
Size: 30 Billion Light Years -
Inflation
Inflation theory states that the Universe underwent a very rapid espansion in a very short amount of time causing the cosmic microwave background radiation to be uniform in all directions that we look. -
Standard Candles
There are two standard ccandles that astronomeres used during this time. They were Cepherd variable stars and la supernovae. -
Dark Matter
Dark Matter is matter that you can not see. Its what holds togother the gas cloud discovered by ROSAT. -
Age and Size
Age: 13.7 Billion Years
Size: 94 Billion Light Years -
Composition of Our Universe
73% of the universe is dark energy, 4% of it si atoms, and 23% of it is dark matter. -
Dr. John C. Mather
NASA scientist who won the Nobel Prize in physics for discoveries about the cosmic microwave background. -
Sceintific Penomenon Solved
Scientists have solved some scientific phenomenons. Two of the ones they solved are the nature of the spiral "nebulae" and how the universe came to be.
