How many stars are there in the universe? (with photos)

It is estimated that the universe contains between 30 and 70 billion trillion stars.

Scientists estimate that there are between 3 and 7 x 10 22 stars in the universe, or between 30 and 70 billion trillion. In fact, that’s a relatively small number by some standards. For example, the number of atoms on Earth is approximately 10 50 , and the number of atoms on Mt. Everest has about 10 40 . The number of atoms in half a kilogram of rock is approximately 10 25 . The Avogadro number, which represents the number of atoms in 12 grams of carbon, is about 6 x 10 23 .

Our own galaxy contains 200-400 billion stars.

The stars of the universe are aggregated into many layers of organization – starting with star clusters, which coalesce into galaxies, which are members of galaxy clusters, which in turn are members of superclusters, which in turn are members of superclusters. superclusters, all the way to the biggest features in the universe, such as the Great Wall, a galactic supercluster that is about half a billion light-years long, a third of a billion light-years wide, and 15 million light-years across. thick light. At their highest level of organization, galactic clusters are distributed into “filaments and voids,” thin filaments of galaxies separated by vast voids.

Space telescopes are used to gather information about the stars in the Universe.

The typical unit of organization in the universe, the galaxy, contains somewhere between about 10 million and a trillion stars. Our Milky Way Galaxy contains between 200 and 400 billion stars, depending on the exact number of low-mass obscure stars, which is highly uncertain. There are approximately 80 billion galaxies in the observable universe, a number similar to the number of stars in a galaxy. These galaxies are spread across a universe that is at least 93 billion light-years across, and perhaps much larger. 93 billion light-years is just the diameter of the universe we can see – the visible universe – reaches of the universe beyond this are obscured by the cosmic microwave background radiation, a field that is created by the hot plasma that was ubiquitous in the early 300,000 years after the Big Bang.

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