half way quiz- cosmology
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Last updated 3:18 AM on 9/8/22
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14 Terms
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cosmology
the study of the universe
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spectral lines
used to identify elements present in stars and galaxies
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what color do you see when something is moving towards you
blue
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what color do you see when something is moving away from you
red
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Hubbles law
galaxies are receding in every direction at velocities proportional to their distance from Earth and each other
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Doppler effect
the apparent change in frequency of a wave caused by relative motion between source of wave and observer
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what does the Doppler effect back up
cosmological red shift
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summary of the Big Bang (1+ sentences)
the Big Bang theory states that the creation of the universe all began with a very hot and denser explosion. This explosion created subatomic particles and as everything continued to cool, expand, and evolve, those particle would combine to slowly form everything in space today.
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list and describe all 3 pieces of evidence for the Big Bang theory
1. cosmological red shift- indicated that the universe is expanding at an increasing rate, so if it is moving apart it must have once been together
2. the percent of hydrogen and helium that exist in the world today- these immense amounts could only have been made in a very hard dense state and then quickly cooled and expanded
3. the cosmic microwave radiation- the stretched out waves support the theory that the universe is expanding from a super high energy state where wavelengths were very short
2. the percent of hydrogen and helium that exist in the world today- these immense amounts could only have been made in a very hard dense state and then quickly cooled and expanded
3. the cosmic microwave radiation- the stretched out waves support the theory that the universe is expanding from a super high energy state where wavelengths were very short
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what is the age of the universe
13.8 billion years
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what is one astronomer from research timeline
Immanuel Kent, Kent asserted that the nebulae are really galaxies separate from and outside of the Milky Way
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what are the two other theories besides the BBT
- steady state theory
- pulsating theory
- pulsating theory
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what does the steady state theory say
There was no beginning and will be no ending to the universe, the universe will appear the same throughout all of time and new matter is created to fill the voids created by expansion
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what does the pulsating theory say
The universe oscillates between expanding and contracting, big bangs and crunches occur repeatedly