Satellites help run the internet and television and are central to the Global Positioning System. They enable modern weather forecasting, help scientists track environmental degradation and play a huge role in modern military technology.

Nations that don't have their own satellites providing these services rely on other countries. For those that want to develop their own satellite infrastructure, options are running out as space fills up.

I am a research fellow at Arizona State University, studying the wider benefits of space and ways to make it more accessible to developing countries.

In the near future, NASA, the European Space Agency (ESA), China, and Roscosmos all mount crewed missions to the moon. This will constitute the first time astronauts have walked on the lunar surface since the Apollo era. But unlike the "race to the moon," the goal of these programs is not to get there first and leave only a few experiments and landers behind (i.e., "footprints and flags" missions), but to establish a sustained human presence on the lunar surface. This means creating habitats on the surface and in orbit that can be used by rotating crews.

While NASA and other space agencies intend to leverage local resources as much as possible—a process known as in-situ resource utilization (ISRU)—creating lunar bases will still require lots of materials and machinery to be shipped from Earth. In a recent study, Philip Metzger and Greg Autry reviewed the cost and energy consumption of building landing pads on the lunar surface.