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HOW MANY GALAXIES ARE IN THE UNIVERSE?
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How many galaxies are in the Universe?
Astronomers think that there are at least
several billion galaxies in the Universe. The exact number is not known. The
estimate of how many galaxies there are in the Universe is done by counting how
many galaxies we can see in a small area of the sky. This number is then used
to guess how many galaxies there are in the entire sky.
Research released in 2016 revised the number
of galaxies in the observable universe from a previous estimate of 200 billion
(2×1011)[7] to a suggested two trillion (2×1012) or more[8][9] and, overall, as
many as an estimated 1×1024 stars[10][11] (more stars than all the grains of
sand on planet Earth).[12] Most of the galaxies are 1,000 to 100,000 parsecs in
diameter (approximately 3,000 to 300,000 light years) and separated by distances
on the order of millions of parsecs (or megaparsecs). For comparison, the Milky
Way has a diameter of at least 30,000 parsecs (100,000 ly) and is separated
from the Andromeda Galaxy, its nearest large neighbor, by 780,000 parsecs (2.5
million ly.) The galaxy is expanding each and every each and every second so we cannot determine the count of them.
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