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LECTURE 26, DECEMBER 7, 2010

ASTR 101, SECTION 3INSTRUCTOR, JACK BRANDT

jcbrandt@unm.edu

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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.

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

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%