I actually thought of something like this;
1) The solar system is a cell, the sun being the nucleus and us being an organelle of the cell. We make up 1 human/other species of animal in an alternate dimension, theirfor we are just atoms, making up something much more bigger, and what makes us up is the same- an alternate dimension.
2)Another theory I have; I am the only living person. This is all a dream, everyone has probably heard this before- but if you think about it; their is no way of prooving that everyone else is real. People can say they are, but how do you know it? Your mind can manifest many things, and for all I know this computer cannot be real. Its alot like the Matrix- but I thought it up before the movie came out; so hah!