The sun is a medium size star. If the sun were as small as an atom, and the the other stars are proportionately as small, how big the Milky-Way galaxy would be? YOu know Sun is a medium sized star. We will use Sun for the comparison.
- Diameter of Sun 1.4 million KM
- Diameter of Milky-Way 100,000 light years
From this, we can compare the size difference between the Sun and the Milky-Way. One light year is 9.46 Trillion kilometers. Which is 9,460,000 million KM. So, in a distance of 1 light year, you can fit (9,460,000/1.4) 6,757,143 Suns.
Now, let is see, how many Suns can fit inside the Milky-Way. With 100,000 light years across, the Milky-Way can fit (6,757,143x100,000) 6,757,143,000,000 Suns.
So, when the sun is as small as an atom, the Milky-Way galaxy would be as big as 6,757,143,000,000 atoms. Let us see, how big space those many atoms can take. One centimeter contains 100,000,000 atoms. So, 6,757,143,000,000 atoms will take a length of ( 6,757,143,000,000/100,000,000) 67,571 centimeters. That is 676 meter (approx.).
When the sun is as small as an atom, the Milky-Way galaxy will be as big as a circle that have a diameter of 676 meter. That circle will have an area of 358,726 square meters. Which is roughly as big as a football stadium.
If the space were microscopic size, if the stars were as small as atom, the galaxies would still be as big as stadiums.
