The Apollo program proved that humans could land on the Moon and do useful work, but due to logistical and technical limitations, individual missions were kept short. For the $28 billion ($283 billion adjusted) spent on the entire program, astronauts only clocked in around 16 days total on the lunar surface. For comparison, the International Space Station has cost an estimated $150 billion to build, and has remained continuously occupied since November 2000. Apollo was an incredible technical achievement, but not a particularly cost-effective way to explore our nearest celestial neighbor.

Leveraging lessons learned from the Apollo program, modern technology, and cooperation with international and commercial partners, NASA has recently published their plans to establish a sustained presence on the Moon within the next decade. The Artemis program, named for the twin sister of Apollo, won’t just be a series of one-off missions. Fully realized, it would consist not only of a permanent outpost where astronauts will work and live on the surface of the Moon for months at a time, but a space station in lunar orbit that provides logistical support and offers a proving ground for the deep-space technologies that will eventually be required for a human mission to Mars.

It’s an ambitious program on a short timeline, but NASA believes it reflects the incredible technological strides that have been made since humans last left the relative safety of low Earth orbit. Operating the International Space Station for 20 years has given the countries involved practical experience in assembling and maintaining a large orbital complex, and decades of robotic missions have honed the technology required for precision powered landings. By combining all of the knowledge gained since the end of Apollo, the Artemis program hopes to finally establish a continuous human presence on and around the Moon.

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