nasa international space station iss earth clouds sts130 shuttle crew photo february 19 2010 iss_sts130_big
The International Space Station as seen by astronauts from NASA's space shuttle Endeavour.

NASA is seeking proposals for the next two private astronaut missions to the International Space Station (ISS), the agency announced Friday.

The first mission is expected to take place between the fall of 2022 and mid-2023, and the second between mid-2023 and the end of 2023.

The agency is seeking proposals from US commercial space companies for the next two missions in an effort to make space accessible to more people than ever before. The news follows a previously announced private mission to the ISS. Earlier in May, NASA and Axiom Space agreed to fly the first private astronauts to the ISS as early as January 2022.

The deadline for proposals for the new missions is July 9, 2021, at 5 p.m. EDT.

NASA defines private astronaut missions as "privately funded, fully commercial spaceflights on a commercial launch vehicle for the purpose of enabling tourism, outreach, commercial research, and approved commercial and marketing activities on the space station."

Phil McAlister, director of commercial spaceflight development at NASA, said in a statement posted on its website: "This year is truly a renaissance for human spaceflight both as we fly NASA and international partner astronauts on US commercial crew spacecraft to the International Space Station and also as we see the expansion of private astronaut missions."

He added that as more people fly to space and do more things during their spaceflights, it attracts even more people to do more activities in Low-Earth orbit (LEO). "It reflects the growing market we envisioned when we began the Commercial Crew Program 10 years ago," he added.

LEO encompasses Earth-centered orbits with an altitude of 2,000 km (1,200 miles) or less, according to NASA.

NASA expects the two new missions to last a period of up to 14 days.

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