Living on the International Space Station (ISS)

• Astronauts spend months in microgravity, so  
 − their blood moves to the head and 1 
 − they lose minerals such as 2  
 − they have to exercise 2.5 hours to avoid 3 loss.  
 − they may suffer from poor 4 back on Earth.  
• NASA continues to improve ways to recycle water, including 5  

Building on the moon or Mars  

• Engineers and architects must either use materials which  
 − are 7 enough for transport.  
 − can already be found on the moon or Mars.  
• Rocks and minerals could be used to make metal, brick and possibly 
7 for buildings.  
• NASA still needs to find a way to make large 8 
• People could use virtual reality  
 − to visit places like a 9 
 − to get a new 10