Astronauts could mine asteroids for food someday, scientists say 

 Material harvested from asteroids could be used to sustain astronauts during long-duration space missions.  

https://cdn.mos.cms.futurecdn.net/ThWMPASDNMXYUdGid9AjSJ.jpg

https://www.space.com/mining-asteroids-food-deep-space-missions