Very Early Universe; Cosmic Microwave BG

Question 1

What does Hubble’s law say about the contents of the early universe ?

Answer 1

highly concentrated; extremely hot and dense until it expanded and cooled down; Evidence for Big Bang

Question 2

CMB

Answer 2

Cosmic Microwave Background

Question 3

An image of the thermal radiation from the Era of Recombination

Answer 3

Cosmic Microwave Background

Question 4

Event that happened about 380,000 years after the Big Bang; produced the CMB

Answer 4

Era of Recombination

Question 5

The CMB consists of ______ radiated from matter in the universe at the time when _____and _____combined to make _____atoms: What was the degrees?

Answer 5

Photons; nuclei; electrons; neutral; 3,000K

Question 6

____ and ____ fuse to form a deuterium nucleus

Answer 6

Proton; neutron; Big Bang Fusion

Question 7

Particle soup - pair production (10^-2 seconds ); synthesis of He - nuclear fusion (3 -5 minutes ); Atoms form - recombination era - 380,000 -700,000 years

Answer 7

Sequence of events in the Early Universe

Question 8

75% H, 25% He, before any stars formed

Answer 8

The early universe’s composition of ordinary matter

Question 9

The fundamental forces were “_____” early on, when the temperature (energy density) was very high. AKA the _____ ______ Theory

Answer 9

unified; Grand Unification

Question 10

Redshifts of galaxies reveal expansion of space

Answer 10

evidence of big bang

Question 11

CMB is the left over radiation from hot, early universe

Answer 11

evidence of big bang

Question 12

He is abundant because it was made in early universe

Answer 12

evidence of big bang