Multiple Choice
What is look-back time?
A) the time it takes for the light from an object to reach Earth
B) the time it takes for a distant object to form
C) the time it takes for an object to orbit once around the Milky Way
D) the age of an object in light years
Correct Answer:
Verified
Correct Answer:
Verified
Related Questions
Q105: What evidence do we have that large
Q114: What assumptions do we make when we
Q115: What type of galaxy has an elongated
Q116: Elliptical galaxies contain more gas,dust,and young stars
Q118: The units of the Hubble constant are
Q120: What can the rotation curve of a
Q121: If H equals 50 km/sec/Mpc,then a galaxy
Q122: What is located between the lobes of
Q123: What observational evidence do we have that
Q124: Why do we expect galaxies to collide