This is the reason to suggest this open source project concept as the beginning of the interplanetary human era.
We can unite many intellects around the world, in order to design more efficient solar energy cells.
Having these cells, we can start building a bigger international space station until it is big enough for building space technology while orbiting the earth.
Once it is able to build techonology, it can improve itself until becoming a full complex halo, that hosts millions of human beings.
Then humankind would probably have evolved enough for traveling to other stars.
Anyone who reads this and has knowledge about solar energy, could be a pioneer of this open source project concept :D