Mars One has trimmed its list of prospects for one-way trips to Mars by a third, going from a pool of 1,058 candidates to 705.
More than 350 hopefuls were eliminated due to medical or personal reasons, the Dutch-based venture said Monday in a news release.
Candidates had been required to turn in a medical statement of health to go to the next stage of the selection process.
Bryan Versteeg / Mars One
An artist's conception shows an astronaut and a robotic rover at the Mars One colony.
Mars One's chief medical officer, Norbert Kraft, said "the medical tests turned out to have a major impact on the candidates' lives, as some of them found out that they needed to undergo an operation, were sick and needed medical attention, or even had a malignant form of cancer that otherwise would not have been detected in such an early stage."
The 705 candidates are aged 18 to 81, with 313 hailing from the Americas. These candidates are to be interviewed by Mars One's selection committee. Several teams of four will be chosen to undergo training for one-way missions to Mars, with the first launch set for as early as 2024. The plan calls for successive crews to set up a permanent colony on Mars.
The multibillion-dollar cost of the project is supposed to be covered primarily by media deals and sponsorships for reality-TV programs focusing on the preparations for the Mars missions. The candidates paid an initial registration fee but are not expected to be charged for their training or flight.
In this week's update, Mars One said it was still negotiating with media companies.
First published May 6 2014, 4:53 PM
Alan Boyle is the science editor for NBC News Digital. He joined MSNBC.com at its inception in July 1996, and took on the science role in July 1997 with the landing of NASA's Mars Pathfinder probe. Boyle is responsible for coverage of science and space for NBCNews.com.
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Boyle joined NBCNews.com from the Seattle Post-Intelligencer, where he was the foreign desk editor from 1987 to 1996. Boyle has won awards for science journalism from numerous organizations, including the National Academies, the American Association for the Advancement of Science and the National Association of Science Writers. Boyle is the author of "The Case for Pluto: How a Little Planet Made a Big Difference." He lives in Bellevue, Wash.