Earth orbit is generally all locations far enough out of Earth's atmosphere so as to be able to circle Earth one or more times without being de-orbited by atmospheric drag (approx. 200 km or 120 miles) yet not so far away from Earth as to be more strongly influenced by other bodies such as Luna or Sol.
- spacedebate.org (wiki/forum): the weaponization of space
- LiftPort: "The Space Elevator Companies", plans to reach geosynchronous orbit using carbon nanotubes (see Nanotechnology) on 2018-04-12
- Space Exploration Technologies: "revolutionizing access to space"
- X Prize Cup: exposition promoting development of space exporation technology