How do we know there are Billions of Galaxies?
Our universe contains at least two trillion galaxies – 10 times more than we thought.
Astronomers led by Christopher Conselice at the University of Nottingham in the UK converted “pencil beam” images of deep space stretching some 13 billion light-years into 3-D maps, allowing them to calculate the density of galaxies in that volume.
This latest analysis uses mathematical models to estimate the number of both visible and hidden galaxies in snapshots like Hubble's famous Deep Field image.
Using this method, Christopher Conselice, who studies galaxy formation at the University of Nottingham, and his team came up with a surprising conclusion: The models suggest that only about ten percent of galaxies in the universe are observable from Earth.
In the next post, we will learn about the "Big Bang" theory.
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