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As you all know, the further the galaxy is from us, measured by redshift, the younger it is supposed to be, but what other features can be seen in those younger galaxies to confirm their age?

Hints: Some particular features of younger age stars, galaxy forms, what afaik changes at 10Gy .

I would be grateful for recommendations of some scientific articles with aggregation of all features and correlation with the "distance-age" measured by redshift.

Thanks a lot.

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