Stefanie Waldek
More from Stefanie Waldek
![Where does outer space start?](https://www.popsci.com/wp-content/uploads/2019/03/18/DZKYO72OSIQSN3S6UN45RUSECM.jpg?w=676)
International Space Station
Where does outer space start? Where does outer space start?
June 1, 2018
![How to become a space tourist: 8 companies (almost) ready to launch](https://www.popsci.com/wp-content/uploads/2019/03/18/KDRXOPJ2REZJ4NIAY566IAYEDE.jpg?w=679)
Private Space Flight
How to become a space tourist: 8 companies (almost) ready to launch How to become a space tourist: 8 companies (almost) ready to launch
April 21, 2018