The figure shown below shows two different versions of the Hubble tuning fork diagram. One was made using what galaxies are like now, while the other was made using what galaxies were like 6 billion years ago. Which one was made using observations of what galaxies were like 6 billion years ago?
A) Version A is from 6 billion years ago because the galaxy mergers that have occurred since that time created more peculiar galaxies.
B) Version A is from 6 billion years ago because there were more galaxies in the past than there are today.
C) Version B is from 6 billion years ago because it has a higher percentage of elliptical galaxies.
D) Version B is from 6 billion years ago because the higher merger rate in the past leads to a larger percentage of peculiar galaxies.
E) There is no way to know since galaxies don't change much as they get older.

Question

The figure shown below shows two different versions of the Hubble tuning fork diagram. One was made using what galaxies are like now, while the other was made using what galaxies were like 6 billion years ago.  Which one was made using observations of what galaxies were like 6 billion years ago?
A) Version A is from 6 billion years ago because the galaxy mergers that have occurred since that time created more peculiar galaxies. 
B) Version A is from 6 billion years ago because there were more galaxies in the past than there are today. 
C) Version B is from 6 billion years ago because it has a higher percentage of elliptical galaxies. 
D) Version B is from 6 billion years ago because the higher merger rate in the past leads to a larger percentage of peculiar galaxies. 
E) There is no way to know since galaxies don't change much as they get older.

Quizplus · Accepted Answer

The Answer of The figure shown below shows two different versions of the Hubble tuning fork diagram. One was made using what galaxies are like now, while the other was made using what galaxies were like 6 billion years ago.  Which one was made using observations of what galaxies were like 6 billion years ago?
A) Version A is from 6 billion years ago because the galaxy mergers that have occurred since that time created more peculiar galaxies. 
B) Version A is from 6 billion years ago because there were more galaxies in the past than there are today. 
C) Version B is from 6 billion years ago because it has a higher percentage of elliptical galaxies. 
D) Version B is from 6 billion years ago because the higher merger rate in the past leads to a larger percentage of peculiar galaxies. 
E) There is no way to know since galaxies don't change much as they get older.

The Figure Shown Below Shows Two Different Versions of the Hubble