Before we settle Mars, scientists must perfect growing space salad | Astronomy.com
https://astronomy.com/news/2020/03/before-we-settle-mars-scientists-must-pefect-growing-space-salad
Missions to Venus: Highlights From History, and When We May Go Back - The New York Times
https://www.nytimes.com/2020/09/14/science/venus-spacecraft-life.html
Pentagon report: China amassing arsenal of anti-satellite weapons - SpaceNews
https://spacenews.com/pentagon-report-china-amassing-arsenal-of-anti-satellite-weapons/
Space debris by the numbers / Space Debris / Space Safety / Our Activities / ESA
https://www.esa.int/Our_Activities/Space_Safety/Space_Debris/Space_debris_by_the_numbers