Multiple Choice
Suppose the universe contained only "normal" matter, like hydrogen, helium, etc. How would the expansion rate of the universe change with time?
A) It would speed up.
B) It would slow down initially but then speed up when the matter pressure became high enough.
C) It would slow down.
D) It is impossible to tell, because it depends on the density of the matter.
Correct Answer:
Verified
Correct Answer:
Verified
Q111: The photons that enter microwave detectors today
Q112: What is it that keeps localized regions
Q113: What is an advantage of quintessence over
Q114: Gravity holds galaxies together. What does the
Q115: How do astronomers measure the relative amounts
Q117: Good evidence for an original Big Bang
Q118: What is the "electroweak" force?<br>A) This is
Q119: When two high-energy gamma-ray photons collide, the
Q120: Even though cosmic microwave background photons outnumber
Q121: What is the temperature of the blackbody