When we look out into space, we are also looking back in time.
Astronomers can trace galaxy development by observing galaxies at great distances to reveal how galaxies appeared long ago.
This example—using the Hubble Ultra Deep Field—showcases how the appearance of galaxies changes across billions of light-years of space—and billions of years in time. Observations from the James Webb Space Telescope will compliment those from Hubble and extend them to the earliest galaxies in the universe.
Credit : NASA, ESA, CSA, STScI.
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