Multiple Choice
The Planck era refers to the:
A) time at which the expanding universe became transparent to radiation.
B) time of extremely rapid inflation that started 10-³⁵ s after the universe began.
C) first 10-⁴³ s of time, when all four fundamental forces were united.
D) present age of the universe as given by Hubble's law.
Correct Answer:
Verified
Correct Answer:
Verified
Q23: According to our current understanding of cosmology,what
Q24: If we compare an elliptical galaxy and
Q25: What do cosmologists study?<br>A) the formation, structure,
Q26: The Milky Way Galaxy is moving at
Q30: The Milky Way Galaxy is moving at
Q31: The fate of a pre-galactic cloud of
Q36: What is the difference between a proton
Q68: What condition is necessary for the universe
Q175: How does the universe behave, according to
Q205: Helium nuclei began permanent formation in the