Great photo. Good question to follow up on, too. It's less than a grain of sand. Earth (assuming that's what you mean as the world) is something of limited, but known size. The universe is infinite, probably... I'd say the world is more like an atom.
So vast, it truly makes one feel small yet still a part of something bigger. I like how all the trails vanish to the horizon and how these two people stand there, so close, like preparing themselves to find a new horizon. Be a part of it. The composition is wonderful as well, like how the sun is starting to shine on them. No matter if we are just a tiny molecule in a grain of sand, we still are here.