1. For the first time NASA is allowing private astronauts on board. The space agency will not be selling directly to customers. Instead it will charge private companies, which can pass on the costs to visitors.
2. A round-trip ticket likely will cost an estimated $58 million. And accommodations will run about $35,000 per night, for trips of up to 30 days long
3. Travelers don't have to be US citizens. People from other countries will also be eligible, as long as they fly on a US-operated rocket.
4. For now, the agency will allow up to two visitors per year. And the private astronauts will have to meet the same medical standards, training and certification procedures as regular crew members.
5. The program is part of NASA's efforts to open the station to private industries, which the agency hopes will inherit the orbiting platform someday.