‘Apollo 11 astronaut Michael Collins dies at 90’:-
www.bbc.co.uk/news/world-us-canada-56921562 & www.theguardian.com/science/2021/apr/28/michael-collins-apollo-11-astronaut-dies-90
Nasa remembers Michael Collins - www.nasa.gov/michael-collins
Katherine Johnson Dies; Mathematician Broke Barriers at NASA - www.nytimes.com/2020/02/24/science/katherine-johnson-dead.html
Katherine Johnson Nasa biography - www.nasa.gov/content/katherine-johnson-biography
Katherine Johnson wikipedia page - https://en.wikipedia.org/wiki/Katherine_Johnson
