It will take the last gear 13.7 billion years to complete a full rotation. That's almost as long as the universe has been around for. : r/interestingasfuck

It will take 13 7 Billion Years for the Last Gear to Complete One Rotation

Our Universe wasn't empty, even before the Big Bang, by Ethan Siegel, Starts With A Bang!

TheLastManicorn (u/TheLastManicorn) - Reddit

How Did The Universe Expand To 46 Billion Light-Years In Just 13.8 Billion Years?

Ken Ham, CEO of 'Answers in Genesis' on the concept of light years. : r /facepalm

This pair of 1911's, also known as the Big Bang Set, are made from 4.5 billion year old meteorites. : r/interestingasfuck

If the universe is only 13.7 billion years old and 1 light year is how long light travels in a year, how have we seen objects farther than 13.8 billion light years away? - Quora

Our Universe wasn't empty, even before the Big Bang, by Ethan Siegel, Starts With A Bang!

Astronomers Reveal That All Galaxies Rotate Once Every Billion Years

How does the Sun occupy 99% of our solar system? - Quora