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While estimates among different experts vary, an acceptable range is between 100 billion and 200 billion galaxies, said Mario Livio, an astrophysicist at the Space Telescope Science...
The universe is 13.8 billion years old, but the observable universe stretches more than 13.8 light-years in every direction. That's because the universe is expanding and light got a head...
How Many Galaxies are there in the Universe 2020? Currently, in 2020, it was estimated that there are around 2 trillion galaxies in the observable Universe. Each galaxy is unique, ranging in size from 10,000 light-years to hundreds of light-years.
It is estimated that there are between 200 billion [ 7 ] (2×1011) to 2 trillion [ 8 ] 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 in the order of millions of parsecs (or megaparsecs).
The best estimate from a 1999 study set that number at about 125 billion galaxies, and a 2013 study indicated that there are 225 billion galaxies in the observable universe. In 2016, that number was upped to 2 trillion, in large part because a new analysis included all the tiny, fluffy galaxies in the early universe.
Most galaxies are between 10 billion and 13.6 billion years old. Some are almost as old as the universe itself, which formed around 13.8 billion years ago. Astronomers think the youngest known galaxy formed approximately 500 million years ago.
The observable universe contains as many as an estimated 2 trillion galaxies [41] [42] [43] and, overall, as many as an estimated 10 24 stars [44] [45] – more stars (and, potentially, Earth-like planets) than all the grains of beach sand on planet Earth.
Recent estimates tell us that there could be as many as two trillion galaxies in the observable Universe.
By knowing the number of galaxies in the Hubble Deep Field, astronomers can estimate how many galaxies there are in the entire universe. Most estimates place the total number of galaxies between 100 billion and 200 billion.
How many galaxies are there in the Universe, and how do we know? One estimate says there are between 100 and 200 billion galaxies.