What do the Hubble Deep Field observations reveal about extremely distant galaxies?

Answer

Galaxies as they appeared a few hundred million years after the Big Bang

The Deep Field observations, including the Hubble Deep Field and the Ultra Deep Field, represent one of Hubble's most profound contributions to cosmology. These observations involve staring at seemingly blank patches of sky for hundreds of hours. Because light travels at a finite speed, observing these distant points means looking backward in time. The light gathered reveals thousands of galaxies existing in their infancy, dating back to periods just a few hundred million years after the Big Bang. This allows astronomers to trace the chronological evolution of galaxy formation, showing how initial matter concentrations grew into the large structures observed in the present universe.

What do the Hubble Deep Field observations reveal about extremely distant galaxies?

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