References

Nasa History
http://history.nasa.gov/sputnik/

Mercury 7
http://history.nasa.gov/40thmerc7/intro.htm

Satelites
http://www.universetoday.com/42198/how-many-satellites-in-space/

Apollo
http://history.nasa.gov/Apollo204/

http://www.nasa.gov/mission_pages/apollo/missions/#.VSZ1aEuTQQT

https://www.nasa.gov/mission_pages/apollo/missions/apollo11.html

Johnson
https://www.nasa.gov/audience/foreducators/a-lifetime-of-stem.html

Images
http://www.nasa.gov/multimedia/imagegallery/image_gallery_2437.html

https://www.hq.nasa.gov/alsj/a11/A11_PAOMissionReport.html

http://www.nasa.gov/topics/history/features/mercury7.html

http://science.howstuffworks.com/space-shuttle.htm

http://www.space.com/28287-yearlong-space-station-mission-mars.html

Space station
http://www.pbs.org/spacestation/station/russian.htm

https://www.nasa.gov/audience/forstudents/k-4/stories/what-is-the-iss-k4.html#.VUdnF0uTQQR

https://www.nasa.gov/mission_pages/station/cooperation/index.html

http://hubblesite.org/gallery/spacecraft/28/web