The expansion of the Universe ____.

The expansion of the Universe ____.
 
  a. was faster in the early Universe when galaxies were close to each other, and has decelerated thereafter
  b. was slower in the early Universe when galaxies were close to each other, and has accelerated thereafter
  c. has been constant throughout the lifetime of the Universe
 d. steadily accelerated from the big bang to the present day
 e. steadily decelerated from the big bang to the present day

Question 2

The _______________ is a thin layer of gas from which Earth receives most of the Sun's light.
 
  Fill in the blank(s) with correct word

Question 3

Dark energy is the term used to describe ____.
 
  a. the pressure inflating voids in the distribution of galaxies
 b. radiation from antimatter and non-baryonic matter
 c. a component of the cosmic microwave background radiation
 d. an effect that works with gravity to decelerate the expansion of the Universe
  e. an effect that works against gravity to accelerate the expansion of the Universe

Question 4

Why was the Davis experiment only able to detect one-third of the neutrinos originally predicted?
 
  a. The number of neutrinos was too great to be held in the tank that Davis designed.
 b. The neutrinos combined with other particles as they entered Earth's atmosphere.
 c. The neutrinos distributed evenly among three different flavors while traveling to Earth.
  d. Most of the neutrinos were absorbed by Earth's atmosphere.
 e. The other two-thirds of neutrinos dissipated while traveling to Earth.

Question 5

Dark matter must be ____.
 
  a. baryonic
 b. non-baryonic
  c. neutral
 d. WIMPs
 e. isochronic