As difficult it is to comprehend that the sun fuses hydrogen and helium every second resulting in the power of 100 billion atomic bombs, it is just as difficult to comprehend the immense size of our universe.
It is estimated that there are an average of 1 – 2 billion stars in any recorded galaxy and there are over 100 billion galaxies in the universe. If 10% of each galaxy contains a solar system, that is, it contains a star with planets revolving around it, then we can estimate that each galaxy has between 100 – 200 million solar systems. If 1% of the stars in each solar system has a planet just distant enough from their sun where life could evolve, we could have 1 – 2 million possible planets that could contain life. And if 1% of these planets have the right ‘ingredients’ to build intelligent life. then there is the possibility that there exists 10,000 stars that could have planets with intelligent life in each galaxy.
Cutting the odds even further, lets take 10% of this result, which would equate to the possibility of 1,000 stars with intelligent life in each galaxy.
That would mean that there could exist 1,000 x 100,000,000 (galaxies) = 1,000,000,000 (1 Quadrillion) planets with intelligent life. How many is that? Take a look at this numerical comparison.
If we use the estimate of 200,000,000 galaxies in the universe, well, that would mean ET lives in over 2 quadrillion planets in our universe.
Don’t even try to comprehend how many fusion reactions occur in the universe every second. Fuhgeddaboudit!