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How are distant (young) galaxies different from the galaxies that we see in the universe today?
To explain:
The difference between distant young galaxies and the galaxies that are seen in the universe today.
Explanation of Solution
Introduction:
Distant young galaxies are different from present day galaxies in terms of star formation, composition and shape. Distant galaxies were present at the time when the universe was only 500 million years old while present day galaxy is about 13.8 years old.
Distant galaxies were small as compared to present day galaxy and rate of star formation was very high in young galaxies and they were numerous, less luminous and rich in gas.
Distant galaxies were small and elliptical as at that time, spiral arms, bulges and disks were not there.They contain mostly old stars and they were irregular and smaller than present day galaxies. Present day galaxies are spiral in shape and they contain young stars with interstellar matter.
Formation of larger galaxies is the result of combination of fragment of old galaxies. The color of galaxy indicates the age of star by which it is populated.Blue galaxies contain hot stars and star formation occurs at high rate.
Conclusion:
Thus,Distant galaxies were small as compared to present day galaxy and rate of star formation was very high in young galaxies and they were numerous, less luminous and gas rich.
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