Here is a good article, endorsed by Elon Musk among others, about the foreseeable problems NASA is facing with the Space Launch System rockets. SLS rockets use hydrogen which, at super-chilled temperatures and high pressures, easily oozes out of any available opening. Space X Raptor engines are fueled with methane (imagine that) which Musk and his engineers think is the best combination of high efficiency and ease of operation. Methane is also easier to produce on Mars where Musk hopes to develop a self-sustaining city.
In light of their respective frontier exploration accomplishments, space exploration and deepwater production are sometimes compared. In that spirit, NASA’s inspector general estimates the Artemis campaign will cost $93 billion between 2012 and 2025, $4.1 billion for a single launch. Each Artemis launch will thus cost approximately as much as developing and producing a 100 million barrel deepwater oil field in the Gulf of Mexico. And, of course, the Artemis program is fully funded by the government, while deepwater oil and gas development is not only privately funded but is an important source of government revenue.
Bud's Offshore Energy (BOE) 