Space is big. Really big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist, but that's just peanuts to space.
Start by picking your favorite spot on the equator. You're going to walk around the world along the equator, but take a very leisurely pace of one step every billion years. Make sure to pack a deck of playing cards, so you can get in a few trillion hands of solitaire between steps.
After you complete your round the world trip, remove one drop of water from the Pacific Ocean. Now do the same thing again: walk around the world at one billion years per step, removing one drop of water from the Pacific Ocean each time you circle the globe. Continue until the ocean is empty.
When it is, take one sheet of paper and place it flat on the ground. Now, fill the ocean back up and start the entire process all over again, adding a sheet of paper to the stack each time you’ve emptied the ocean. Do this until the stack of paper reaches from the Earth to the Sun.
Take a glance at the timer, you will see that the three left-most digits haven’t even changed. You still have 8.063 × 10⁶⁷ more seconds to go. So, take the stack of papers down and do it all over again. One thousand times more. Unfortunately, that still won’t do it. There are still more than 5.385 × 10⁶⁷ seconds remaining. You’re just about a third of the way done. [1]
Well, the volume of the visible universe is 3.4 × 10⁸⁰ m³ and therefore another factor of 4.2 trillion larger than 52!. And then the entire universe is estimated to be at least another 150 or 250 times larger than the visible universe. In diameter, not volume.
At 4km per hour, it takes 11 years of continuous walking to walk the distance between Earth and the Moon; 4252 years to the Sun; 214041 years to Pluto; 1.17 billion years to Alpha Centauri.
Assuming single celled organisms travel very slowly, that means if you have been walking your entire lifetime to Alpha Centauri, and your parents did the same and gave birth to you on their way to Alpha Centauri, and their parents gave birth to them on their way to Alpha Centauri, ancestors all the way back to the first biotic life form, you'd be just about arriving, now.
It does also mean, the sum of all distance traveled by all lifeforms on Earth is longer than the distance between Earth to Alpha Centauri and back by quite a few times, that can likely be measured in the billions.