In the very first phase after the big bang, when the Universe was ...

[RRMR]

In the very first phase after the big bang, when the Universe was about a microsecond old, space was filled with____.
 
  a. high-energy photons
  b. protons and antiprotons
 c. protons, neutrons, electrons, and positrons (anti-electrons)
  d. electrons, and positrons (anti-electrons)
 e. protons, neutrons, electrons

Question 2

When mapping the interior of the Sun, astronomers must measure _____ as the photosphere moves up and down.
 
  a. Doppler shifts
 b. magnetic fields
  c. sunspots
 d. limb darkening
  e. supergranules

[cegalasso]

Answer to Question 1

a

Answer to Question 2

a

[RRMR]

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[cegalasso]

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