There are about 51 galaxies in the Local Group (see list of nearest galaxies for a complete list), on the order of 100,000 in the Local Supercluster, and an estimated 100 billion in all of the observable universe..
Galaxies, galaxy groups and clusters, superclusters, and galactic walls are arranged in twisting, threadlike structures called the cosmic web.
The web forms as the gravitational attraction of the universe's matter draws larger and larger objects together..
Most cosmologists believe that the galaxies that we observe today grew gravitationally out of small fluctuations in the nearly-uniform density of the early universe..
Most cosmologists believe that the galaxies that we observe today grew from the gravitational pull of small fluctuations in the nearly-uniform density of the early universe..
It is estimated that there are between 200 billion (2\xd71011) to 2 trillion galaxies in the observable universe.
Most galaxies are 1,000 to 100,000 parsecs in diameter (approximately 3,000 to 300,000 light years) and are separated by distances on the order of millions of parsecs (or megaparsecs)..
Galaxies are vast cosmic islands of stars, gas, dust, and dark matter held together by gravity..
Cosmology is the study of the origin, development, structure, history, and future of the entire universe..
Researchers confirmed that the distant galaxies discovered by the James Webb Space Telescope are, indeed, perfectly compatible with our modern understanding of cosmology.
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Those galaxies were so massive and appeared so early that they, the headlines claimed, "broke" the Big Bangmodel of cosmology.
The claim went viral, but as with many things on the internet, it's simply not true.
Now, there's more research to back up the Big Bang.
Two of those, CEERS (the Cosmic Evolution Early Release Science Survey) and GLASS (the Grism Lens–Amplified Survey from Space), independently spent dozens of hours looking for galaxies in the early universe by staring at separate small portions of the sky.
Cosmologists study the large-scale structure and BAO to measure the rate of cosmic expansion and understand how galaxies are organized on the largest scales.
All the atoms in the universe only make up about 5% of its total contents.
The rest is dark matter and dark energy.
