The space colonies are more or less federated with the Earth.

I bet they'll start the space colonies inside twenty years.

One of the ways we were going to make space colonies pay for themselves was through electricity.

And finally, the first space colony was moving away from the devastated planet.

It forced most of the earth population into space colonies.

However, many people have put forward ideas and thought about the first space colony.

Near the end of the 21st century Earth begins to become over populated leading to many people living in man made space colonies.

Just how could a planet or a space colony defend itself from outside attack?

Also, the slowly growing population would buy centuries of time to figure out new places to live, such as space colonies.

But it doesn't take much to kill a space colony.