[ 1 ] Roulette J. How much does a ticket to space on new Shepard cost? Blue Origin isn’t saying [Internet]. New York: New York Times; 2021 Oct 13 [cited 2021 Dec 5]. Available from: https://www.nytimes.com/2021/10/13/science/space/ blue-origin-ticket-cost.html. 链接1

[ 2 ] Virgin galactic has sold 100 more space tickets [Internet]. Douglas: Phys.org; 2021 Oct 9 [cited 2021 Dec 5] Available from: https://phys.org/news/2021-11- virgin-galactic-sold-space-tickets.html. 链接1

[ 3 ] Wilson EK. Space tourism moves closer to lift off [Internet]. Engineering 2019;5(5):819–21. 链接1

[ 4 ] Taylor A. How the collapse of the Soviet Union aided the birth of space Tourism [Internet]. Washington, DC: Washington Post; 2021 Jul 20 [cited 2021 Dec 5]. Available from: https://www.washingtonpost.com/world/2021/07/20/spacetourists-russia-soviet/. 链接1

[ 5 ] Wall M. First space tourist: how a U.S. millionaire bought a ticket to orbit [Internet]. New York: Space; 2011 Apr 27 [cited 2021 Dec 5]. Available from: https://www.space.com/11492-space-tourism-pioneer-dennis-tito.html. 链接1

[ 6 ] Roulette J. Russian film crew wraps space station shoot and returns to earth [Internet]. New York: New York Times; 2021 Oct 17 [cited 2021 Dec 5]. Available from: https://www.nytimes.com/2021/10/17/science/russia-filmspace-station.html. 链接1

[ 7 ] Howell E. SpaceShipTwo: a flight path to space tourism [Internet]. New York: Space; 2019 Mar 5 [cited 2021 Dec 5]. Available from: https://www. space.com/19021-spaceshiptwo.html. 链接1

[ 8 ] Learn: welcome to the world of Virgin Galactic [Internet]. Mojave: Virgin Galactic; [cited 2021 Dec 5]. Available from: https://www.virgingalactic.com/ learn/. 链接1

[ 9 ] Davenport C. Richard Branson and his Virgin Galactic crew are safely back from space, ushering in a new era [Internet]. Washington, DC: Washington Post; 2021 Jul 11 [cited 2021 Dec 5]. Available from: https://www. washingtonpost.com/technology/2021/07/11/richard-branson-virgin-galacticlive-updates/. 链接1

[10] Harwood W. Richard Branson and virgin galactic complete successful space flight [Internet]. New York: CBS News; 2021 Jul 12 [cited 2021 Dec 5]. Available from: https://www.cbsnews.com/news/richard-branson-virgingalactic-space-launch/. 链接1

[11] Mann A. What are the chances that Jeff Bezos won’t survive his flight on New Shepard? [Internet]. New York: Space; 2021 Jul 17 [cited 2021 Dec 5]. Available from: https://www.space.com/jeff-bezos-odds-death-blue-originnew-shepard-launch. 链接1

[12] Neuman S. Jeff Bezos and Blue Origin travel deeper into space than Richard Branson [Internet]. Washington, DC: NPR; 2021 Jul 20 [cited 2021 Dec 5]. Available from: https://www.npr.org/2021/07/20/1017945718/jeff-bezosand-blue-origin-will-try-to-travel-deeper-into-space-than-richard-bra. 链接1

[13] New Shepard [Internet]. Kent: Blue Origin; [cited 2021 Dec 5]. Available from: https://www.blueorigin.com/new-shepard/. 链接1

[14] Bacon J, Kelly E. ‘Best day ever’: Jeff Bezos, Blue Origin rocket touch down after historic spaceflight [Internet]. McLean: USA Today; 2021 Jul 20 [cited 2021 Dec 5]. Available from: https://www.usatoday.com/story/news/nation/2021/ 07/20/jeff-bezos-space-flight-blue-origin-launch/8013544002/. 链接1

[15] Chow D. Blue Origin sends William Shatner to edge of space [Internet]. New York: NBC News; 2021 Oct 13 [cited 2021 Dec 5]. Available from: https:// www.nbcnews.com/science/space/william-shatner-set-launch-blue-originnew-shepard-flight-rcna2858. 链接1

[16] Davenport C. Jeff Bezos’s Blue Origin sends TV’s Michael Strahan and five others to space [Internet]. Washington, DC: Washington Post; 2021 Dec 11 [cited 2021 Dec 13]. Available from: https://www.washingtonpost.com/ technology/2021/12/11/blue-origin-bezos-strahan-shepard/. 链接1

[17] Koren M. Jeff Bezos is ready to cross a cosmically controversial line [Internet]. New York: The Atlantic; 2021 Jul 19 [cited 2021 Dec 5]. Available from: https://www.theatlantic.com/science/archive/2021/07/jeff-bezos-blue-originbranson/619476/. 链接1

[18] Mann A. SpaceX now dominates rocket flight, bringing big benefits—and risks—to NASA [Internet]. Washington, DC: Science; 2020 May 20 [cited 2021 Dec 5]. Available from: https://www.science.org/content/article/spacex-nowdominates-rocket-flight-bringing-big-benefits-and-risks-nasa. 链接1

[19] Sheetz M. Bezos’ Blue Origin loses NASA lawsuit over SpaceX $2.9 billion lunar lander contract [Internet]. New York: CNBC; 2021 Nov 4 [cited 2021 Dec 5]. Available from: https://www.cnbc.com/2021/11/04/bezos-blue-origin-loseslawsuit-against-nasa-over-spacex-lunar-lander.html. 链接1

[20] Davenport C. Citing China threat, NASA says moon landing now will come in 2025 [Internet]. Washington, DC: Washington Post; 2021 Nov 9 [cited 2021 Dec 5]. Available from: https://www.washingtonpost.com/technology/2021/ 11/09/nasa-moon-artemis-spacex-china/. 链接1

[21] Thompson A. SpaceX’s private Inspiration4 crew returns to earth with historic splashdown off Florida coast [Internet]. New York: Space; 2021 Sep 18 [cited 2021 Dec 5]. Available from: https://www.space.com/spacex-inspiration4- returns-to-earth. 链接1

[22] O’Callaghan J. Inspiration4: why SpaceX’s first all-private mission is a big deal [Internet]. Cambridge: MIT Technology Review; 2021 Sep 15 [cited 2021 Dec 5]. Available from: https://www.technologyreview.com/2021/09/15/1035797/ inspiration4-spacex-private-mission/. 链接1

[23] Wall M. Virgin Galactic sells 100 new tickets for space tourist launches [Internet]. New York: Space; 2021 Nov 10 [cited 2021 Dec 5]. Available from: https://www.space.com/virgin-galactic-sells-100-spacetourist-tickets. 链接1

[24] Levin T. Virgin Galactic wants to send tourists to space 3 times per month once its new spaceship is ready in 2023 [Internet]. New York: Business Insider; 2021 Nov 9 [cited 2021 Dec 5]. Available from: https://www. businessinsider.com/virgin-galactic-space-tourism-flights-2023-new-ship2021-11. 链接1

[25] Kooser A. SpaceX signs ‘blockbuster deal’ to send space tourists to the ISS [Internet]. San Francisco: CNET; 2021 Jun 2 [cited 2021 Dec 5]. Available from: https://www.cnet.com/news/spacex-signs-blockbuster-deal-to-send-spacetourists-to-the-iss/. 链接1

[26] Shepardson D. FAA allows Virgin Galactic to resume launches after mishap probe [Internet]. London: Reuters; 2021 Sep 29 [cited 2021 Dec 5]. Available from: https://www.reuters.com/business/aerospace-defense/faa-closesprobe-into-july-11-virgin-galactic-launch-2021-09-29/. 链接1

[27] Roulette J. SpaceX’s toilet is working fine, thanks for asking [Internet]. New York: New York Times; 2021 Nov 10 [cited 2021 Dec 5]. Available from: https://www.nytimes.com/2021/11/10/science/spacex-toilet-diapers.html. 链接1

[28] Wattles J. An alarm went off on SpaceX’s all-tourist flight. The problem was the toilet [Internet]. Atlanta: CNN; 2021 Sep 27 [cited 2021 Dec 5]. Available from: https://www.cnn.com/2021/09/25/tech/spacex-toilet-waste-managementsystem-scn/index.html. 链接1

[29] Grossman D. There will be no toilets or barf bags on Blue Origin rockets [Internet]. New York: Popular Mechanics; 2017 Apr 12 [cited 2021 Dec 5]. Available from: https://www.popularmechanics.com/space/rockets/a26042/ no-toilets-blue-origin-rockets/. 链接1

[30] Davenport C. Richard Branson and Jeff Bezos will fly to space at their own risk. Does that make it right for everyone? [Internet]. Washington, DC: Washington Post; 2021 Jun 23 [cited 2021 Dec 5]. Available from: https://www. washingtonpost.com/technology/2021/06/23/space-tourism-faa-regulation/. 链接1

[31] Plaugic L. This is what happens when a tiny piece of flying space debris hits the ISS [Internet]. New York: The Verge; 2016 May 12 [cited 2021 Dec 5]. Available from: https://www.theverge.com/2016/5/12/11664668/iss-window-chipspace-debris-tim-peake. 链接1

[32] Palmer C. SpaceX starship lands on earth, but manned missions to mars will require more. Engineering 2021;7(10):1345–7. 链接1

[33] Ryan J. SpaceX moon mission billionaire reveals who might get a ticket to ride starship [Internet]. San Francisco: CNET; 2021 Jul 15 [cited 2021 Dec 5]. Available from: https://www.cnet.com/news/spacex-moon-missionbillionaire-reveals-who-might-get-a-ticket-to-ride-starship/. 链接1

[34] Wattles J. First space station tourist in ten years docks at ISS [Internet]. New York City: CNN Business; 2021 Dec 9 [cited 2021 Dec 9]. Available from: https://www.cnn.com/2021/12/07/tech/space-tourism-maezawa-soyuz-scn/ index.html. 链接1