LECTURE 26, DECEMBER 7, 2010 ASTR 101, SECTION 3 INSTRUCTOR, JACK BRANDT [email protected] 1ASTR...
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Transcript of LECTURE 26, DECEMBER 7, 2010 ASTR 101, SECTION 3 INSTRUCTOR, JACK BRANDT [email protected] 1ASTR...
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ASTR 101-3, FALL 2010 1
LECTURE 26, DECEMBER 7, 2010
ASTR 101, SECTION 3INSTRUCTOR, JACK BRANDT
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Question 9
In the first few minutes after the Big Bang
a) the universe cooled and formed neutral matter.
b) the cosmic microwave background radiation was released.
c) electrons recombined with protons.d) hydrogen fused into deuterium and then
helium.e) the universe was governed by one unified
super-force.
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a) the universe cooled and formed neutral matter.
b) the cosmic microwave background radiation was released.
c) electrons recombined with protons.d) hydrogen fused into deuterium and then
helium.e) the universe was governed by one unified
super-force.
Question 9
In the first few minutes after the Big Bang
The production of elements heavier than hydrogen by nuclear fusion is “primordial nucleosynthesis.”
The amount of deuterium we see today is an important clue to the density of this early universe.
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a) the Steady State Theory.b) the Grand Unified Theories.c) the Inflationary epoch.d) dark matter.e) decoupling of matter from radiation.
Question 10
The universe appears flat; this is explained by
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a) the Steady State Theory.b) the Grand Unified Theories.c) the Inflationary epoch.d) dark matter.e) decoupling of matter from radiation.
Question 10
The universe appears flat; this is explained by
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COSMOLOGY SUMMARY
• Time since the Big Bang = 13.7 billion yrs.• First stars at 400 million years• The Universe is flat or Ωo = 1• CONTENTS: Ordinary Matter = 4%; Dark
Matter = 22%; Dark Energy = 74%