Unit 6 Lesson 2

Cosmic microwave background (CMB)

• is an electromagnetic radiation that reaches Earth from every direction in space

• will be a radiowave in the future

• is a result of EMR shrinking

• originates from the center of the galaxy

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Cosmic Microwave Background has:

• a temperature of 3 K

• no temperature

• changing temperature

• temperature which cannot be measured

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Cosmic Microwave Background

• is evidence in support of the Big Bang theory

• is evidence in support of the expanding universe

• is evidence in support of the steady state theory

• is evidence in support of EMR

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Which theory describes an infinite universe?

• Static Theory

• Steady State Theory

• Big Bang Theory

"The universe exists now as it always has" is a view of the

• Static Theory

• Steady State Theory

• Big Bang Theory

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"The formation of matter is at a rate that maintains a steady density as the universe expands" is the

• Static Theory

• Steady State Theory

• Big Bang Theory

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"All matter and energy in the universe was once extremely compressed and then expanded suddenly in all directions." is the

• Static Theory

• Steady State Theory

• Big Bang Theory

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In a steady state universe:

• changes would occur uniformly through space and time

• young and old matter would be mixed together

• distant galaxies would appear younger

• there would be no changes

According to the big bang theory:

• CMB first appeared when protons, neutrons and electrons appeared

• CMB first appeared when space becomes transparent

• CMB first appeared when supernovae appeared

• CMB first appeared when the universe was 380,000 years old

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At about 380,000 years after the big bang:

• space became transparent

• neutral atoms formed

• protons and neutrons combined

• light was a microwave

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