Author Question: During one phase of the big bang, gamma ray photons were creating electrons and positrons ... (Read 92 times)

Destiiny22 · **on:** Jul 27, 2018

During one phase of the big bang, gamma ray photons were creating electrons and positrons (anti-electrons). At this time, the Universe also contained ____.

a. protons and antiprotons
b. protons and neutrons
c. neutrons only
d. no other matter or antimatter
e. neutral atoms

Question 2

Galileo proposed that the Sun is a rotating sphere after he ____.

a. noted how the Sun rose in the east and set in the west
b. discovered the parallax of the Sun
c. timed a full rotation of the Sun's equator
d. observed sunspots move across the surface of the Sun
e. measured different spectral lines of emission on different days