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Right now, the space agency’s strategy for getting back to the lunar surface relies on building a space station in orbit around the Moon, called the Gateway. Such a platform would serve as a way station for astronauts to travel to and from the Moon’s surface. Additionally, NASA has been focusing on developing a new monster rocket called the Space Launch System (SLS), which would be used to launch a crew capsule called Orion into deep space. Not only would the SLS send people to the Gateway, but it would also be used to deliver cargo and help bring new modules to the lunar space station. And just recently, NASA called on commercial companies to come up with designs for landers that could transport humans from the Gateway to the Moon.

However, NASA does not plan to start building the Gateway until 2022, and doesn’t intend to test out the first human-rated landers on the Moon until the mid-2020s. Additionally, the SLS has suffered from a series of delays and cost overruns that threaten the current unaccelerated timeline. The rocket was originally expected to launch as early as 2017, sending the Orion capsule on a three-week-long trip around the Moon. But the rocket’s debut flight has since been pushed back to June of 2020. And recently, NASA officials admitted that the 2020 date will most likely move to 2021 — a move that apparently angered those within the administration. The delay prompted NASA to consider alternatives for launching Orion in 2020, including using commercially available rockets such as SpaceX’s Falcon Heavy or ULA’s Delta IV Heavy instead of the SLS.

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