Multiple Choice
Given that the universe is about 14 billion years old,which of the following statements is logically valid?
A) All galaxies nearby us are about 14 billion years old.
B) All galaxies that we can see are about 14 billion years old.
C) All galaxies that we see have an age that is approximately equal to the age of the universe today,minus the lookback time (or light travel time) corresponding to the redshift of that galaxy.
D) The oldest galaxies we see at great distances are younger than the oldest galaxies we see nearby.
Correct Answer:

Verified
Correct Answer:
Verified
Q40: What does the equivalent of an H-R
Q41: Which of the following statements about galaxies
Q42: Spectral lines from Galaxy B are redshifted
Q43: The disk component of a spiral galaxy
Q44: How does the age of the universe
Q46: The larger the value of Hubble's constant,the
Q47: Based on current estimates of the value
Q48: Overall,what is our most accurate technique for
Q49: Based on the number of galaxies visible
Q50: What is a Cepheid variable?<br>A)It is a