A Universe full of Galaxies

One peek into a small part of the sky, one giant leap back in time. The Hubble telescope has provided mankind’s deepest, most detailed visible view of the universe.

Because light takes billions of years to reach Earth from very distant galaxies, we see them as they were billions of years ago. Many of the smaller galaxies are very young galaxies.

The exposure time was of approximately 23 days. The faintest galaxies are one ten-billionth the brightness of what the human eye can see.

XDF size compared with the size of the moon credit: NASA, ESA, and Z. Levay (STScI)

mature galaxies, nearly mature galaxies and protogalaxies separated credit: NASA, ESA, and Z. Levay, F. Summers (STScI)

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