Assuming that all galaxies in a picture are formed at about the same time, the galaxy which is the youngest is: C) the one that is farthest away.
A galaxy can be defined as a collection (group) of many billions of stars, that are existing independently or by themselves.
Generally, the greatest number of stars are found in a galaxy.
One of the most important characteristic of a galaxy is that, it comprises billions of stars with different age, ranging from the youngest star to the oldest.
Based on astronomy, a star that is closest to mankind (us) is the oldest while the one that is farthest away is the youngest.
In conclusion, the closer a star is to us, the older it is and the farther it is to us, the younger it is.
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