1. https://www.republicworld.com/technology-news/science/nasa-2008 -contract-saved-spacex-from-fourth-straight-failure-admits-elon-musk.html.

2. https://www.nasa.gov/home/hqnews/2008 /dec/HQ_C08–069_ISS_Resupply.html.

3. https://www.britannica.com/technology/Falcon-launch-vehicle.

4. https://www.space.com/virgin-galactic-richard-branson-first-spaceflight-photos; < https://www.hindustantimes.com/science/did-richard-branson-really-fly-into-space-neil-degrasse-tyson-weighs-in-101626411110372.html.

5. https://www.space.com/suborbital-orbital-flight.html.

6. https://www.fr.de/panorama/richard-branson-weltall-virgin-galactic-vss-unity-raumfahrt-weltraum-jeff-bezos-live-ticker-zr-90854378 .html.

7. https://eu.usatoday.com/story/tech/2022 /02 /15 /virgin-galactic-tickets-space-trip/6795121001 /.

8. https://www.space.com/jeff-bezos-blue-origin-first-astronaut-launch.

9. https://www.youtube.com/watch?v=VUdXvgi6 qNw.

10. https://www.sueddeutsche.de/wirtschaft/jeff-bezos-flug-weltall-1 .5357492 .

11. https://www.mdr.de/wissen/wo-beginnt-das-weltall-karman-linie-100 .html.

12. https://www.mdr.de/wissen/captain-kirk-enterprise-william-shatner-fliegt-ins-all-100 .html.

13. https://www.welt.de/wissenschaft/article106365830 /Scottys-Asche-kreist-im-zweiten-Anlauf-im-Weltall.html.

14. https://www.whereisroadster.com/.

15. https://www.wired.com/story/spacex-successfully-launches-the-falcon-heavyand-elon-musks-roadster/.

16. https://www.businessinsider.com/starman-elon-musk-car-orbit-collision-risk-calculations-2018 –2 .

17. Rein, Hanno/Tamayo, Daniel/Vokrouhlicky, David (2018 ): The random walk of cars and their collision probabilities with planets, Aerospace 2018 , 5 (2 ), 57 , https://www.mdpi.com/2226 –4310 /5 /2 /57 .

18. https://www.inverse.com/innovation/spacex-mars-city-codex.

19. https://www.swr.de/wissen/tomorrow-now-102 .html.

20. https://www.zarm.uni-bremen.de/de/fallturm/allgemeine-informationen.html.