One of the negative externalities of the space age, is the debris resulting from abandoned satellites. Currently there about 128 million pieces of old spacecrafts floating around, pieces that are up to 10 cm in size. Though this does not seem threatening, the kinetic energy of these parts is so high, they can destroy operational satellites. Continue reading Fees against junk?
Space colonization will only be viable if we are able to launch stuff into outer space at reasonable cost. Currently spaceflight depends on chemical rockets to reach orbit. However, chemical rockets suffer from a severe bottleneck. Continue reading Laser beam propulsion