We live in a time of billions; billions of galaxies, stars, people, light-years…but how do we put something like this into perspective? Can we really understand what a “billion” means? The short answer: no. Your brain is not capable of comprehending one billion in its raw essence.
Now, this is all relative. We can comprehend a meter, which is one billion nanometers, but even if I could express to you how small a nanometer is, you probably wouldn’t be able to comprehend all of the nanometers in a meter at once. This can be analogous to viewing a picture with a large number of pixels - you don’t see all of the pixels, you see the complete picture. It’s just how our brain works. The below image helps you understand, to some degree, just how much one billion is.
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