If the Milky Way was the size of a Football Field...

How big would the sun be, in milimeters?

This is going to be very small. :P

Let's say the football field is 200 meters.

100,000ly/200 = 500 light years/meter.

The sun's diameter would then be 1,400,000/5,000,000,000,000,000 = 0.00000000028m

= 0.00000028mm lol.

there isn't a football field on the planet (NFL or soccer) that is 200meters long

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If the Sun were 3 inches in diameter and placed at the End of the End Zone of a Football field, then Mercury would be 8 feet away (or 36,000,000 miles) with each foot equalling almost 4,000,000 miles! Venus would be 17 Feet from the Sun (or 67,000,000 million miles). Earth orbits 22 feet away