A Physicist’s Perspective on God by Alan Tai.
The book’s subtitle is “Roadmaps to Wisdom Through Science and Life” is very interesting, to say the least.
He broke down different sections of the book to easily find topics for reference. The table of contents attracted me to where I wanted to go first. I did go back and read the rest of the book, by the way. I did comments on some of the chapters but left some open because the titles were somewhat explanatory and you need to read for yourself…. (Read more from https://www.twomeasuresfoolish.org/book-review-a-physicists-perspective-on-god/ )

Reducing the scale of our entire solar system to the size of a coin of about 2cm ( US quarter ) gives us perspective about the size of Milky Way with respect to our solar system . On this scale, the overall size of our Milky Way galaxy would be close to the size of the United States! Since the sun is at the center but smaller than the solar system, the sun appears like a small piece of dust based on the model scale of Milky Way to the United States. If we shrink the Milky Way galaxy to the scale of 1 m2, the entire solar system is smaller than the nucleus of a human cell. The Earth is even much smaller in this scale , let alone the size of humans with respect to our galaxy.

Another helpful mental model shows the comparative size of the universe we can see. Our entire Milky Way galaxy is further reduced to the scale size of a CD. The adjacent galaxy that is closest to Milky Way is the spiral galaxy, name “Andromeda.” On this scale, Andromeda will appear to be about eight feet away. Due to the time it takes light to travel in space, the farthest galaxies we have ever seen once its light reaches us, as seen in the Hubble Deep Field, would be about nine miles away. When the light from the edge of the observable universe reaches us, it shows us the beginning of the universe during the start of the Big Bang. Therefore, it gives us some idea about the age of the universe . The furthest we can possibly see of the entire universe is about ten miles from us on the scale of Milky Way to a regular CD. This corresponds to about fourteen billion light years away from our planet Earth.

How big is the universe?
No one knows how big the universe would be, as the light beyond the furthest and observable edge of the universe has yet to reach us. We can wonder if the universe is infinitely large, or if ours is the only universe out in the space. Astronomers have secondary evidence and some physical models to predict that the universe of galaxies spreads far beyond the region we can observe. How big this universe is and its billions of years of existence will blow our minds and imaginations!

Ref. :
1) https://www.twomeasuresfoolish.org/book-review-a-physicists-perspective-on-god/
2) https://www.cfa.harvard.edu/seuforum/howfar/howfar.html, or https://www.cfa.harvard.edu/seuforum/howfar/HowBigUniverse.pdf
3) Estimated as of 2015 around 13.799±0.021 billion years for the age of the universe, Planck Collaboration (2016). “Planck 2015 results. XIII. Cosmological parameters (See Table 4 on page 32 of pdf).” Astronomy and Astrophysics. 594: A13.

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