In
a photo like the Hubble eXtreme Deep Field, we see galaxies in many
different stages of their lives. In general, which galaxies are seen in
the earliest (youngest) stages of their lives?

Question

In
 a photo like the Hubble eXtreme Deep Field, we see galaxies in many 
different stages of their lives. In general, which galaxies are seen in 
the earliest (youngest) stages of their lives?

Answer

The galaxies that are farthest away, because the light that reaching us from those galaxies the longest time ago and we are seeing the time when the galaxies were young

Answer

The galaxies that are the reddest in colour, because these are the stars that are the most numerous in galaxies

Answer

The galaxies that are nearest to us, because they were born after the more distant galaxies

Answer

The galaxies that have the most hot, young stars of spectral types O and B, because these are the stars that are present in young galaxies

Crowdly

In a photo like the Hubble eXtreme Deep Field, we ...

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