Several hundred would-be Mars colonists have just had their hopes and dreams dashed.

The Netherlands-based nonprofit Mars One, which aims to establish a Red Planet settlement beginning in 2025, announced Monday (May 5) that it had sliced its pool of potential colonists from 1,058 down to 705. The remaining astronaut candidates now advance to an interview round with Mars One's selection committee.

"Were incredibly excited to start the next phase of Round 2, where we begin to better understand our candidates who aspire to take such a daring trip," Mars One chief medical officer Norbert Kraft said in a statement. "They will have to show their knowledge, intelligence, adaptability and personality." [Images of Mars One's Red Planet Colony Project]

The Dutch nonprofit Mars One aims to land four colonists on the Red Planet in 2023. Do you want to be one of them?

The 353 people who didn't make it were eliminated for personal or medical reasons, Mars One representatives said. The 418 men and 287 women who survived this latest cut come from all over the world, with 313 hailing from the Americas, 187 from Europe, 136 from Asia, 41 from Africa and 28 from Oceania.

Mars One plans to launch its first crew of four Mars colonists in 2024, with touchdown on the Red Planet coming in 2025. Additional crews will blast off in two-year increments thereafter, gradually building up the off-world settlement. At the moment, there are no plans to bring these pioneers back to Earth.

The organization will mount several unmanned Mars missions in the next decade to demonstrate technologies and prepare for the arrival of people. For example, it aims to launch a robotic lander and orbiter in 2018, a scouting rover in 2020 and six cargo missions in 2022.

Mars One plans to pay for all this by organizing a global media event around the Mars colonization effort, from astronaut selection through the settlers' time on the Red Planet. It's already negotiating with media companies about showing Round 2 of the selection process on TV, representatives said.

"Once the television deal is finalized and the interviews begin, the stories of the 705 aspiring Martians will be shared with the world," Mars One said in a press release Monday.

More than 200,000 people applied to become Mars One astronauts. In December, the organization slashed this pool down to 1,058 candidates.

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Private Mars One Colony Project: 705 Astronaut Candidates Pass Latest Cut