Space Junk Sammy App for iOS
'Space Junk Sammy is a fun and educational new app from NASA! Space junk is becoming a big problem for many of NASA’s space missions. We need your help to clean up the junk in orbit! In this game, you clean up space and learn about NASA at the same time. Explore the orbits around Earth, Moon and Mars and upgrade your spacecraft with cool new equipment like laser deflectors and rocket attachments. Grab coins to purchase upgrades and you can help NASA! Space Junk Sammy is developed by the NASA Space Operations Learning Center.'
This is a free app