Colonizing Mars has long represented one of the more ambitious dreams for space travel proponents ranging from NASA scientists to Silicon Valley entrepreneur and SpaceX founder Elon Musk. The latter also envisions sending humans to Mars sometimes in the next several decades, and has mused about how to build a Mars colony population of 1 million people in an Aeon interview.

Mars One — a nonprofit organization based in the Netherlands — shares some of the Musk’s goals and indeed, the Mars One vision relies on Musk’s SpaceX’s Falcon Heavy rocket. But Mars One’s concept of seeding Mars with human colonies by launching one-way missions recently received some close scrutiny from a team of MIT researchers.

The MIT team’s critique identified potential challenges and estimated that settling the first batch of Mars colonists would require about 15 launches of the Falcon Heavy rocket being developed by Musk’s firm SpaceX at a cost of $4.5 billion. MIT also suggested that Mars One may want to dial back its aggressive schedule of sending four-person crews every 26 months starting in 2024.

The MIT paper took a particularly close look at the Mars One idea that it could establish a sustainable colony on Mars using existing technology starting in the 2020s, according to Space Policy Online. MIT’s researchers concluded that Mars One was overreaching with its statement that “no new major developments or inventions are needed” to make such an effort possible. In a Reddit AMA, they also urged Mars One to take a slower-paced approach that field-tested all the necessary habitat equipment on the red planet before sending humans.

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