Area List

Hi guys, i got to do science questions and im stuck on few questions, can someone help with references if possible please? thanks in advance

*What are the main difficulties involved in the following areas of manned space flight and how could they be overcome? (write not more than two or three sentences about each area).

1.fuel
Problem:
Solution:

What are the main difficulties involved in the following areas of manned space flight and how could they be overcome? (write not more than two or three sentences about each area).

1.fuel
Problem:
Solution:

*and
*5.maintaining a stable atmosphere
Problem:
Solution:

7.keeping warm
Problem: it is really cold out in space
Solution:

1. Large spaceships need a lot of fuel. Efficiency can be improved and the ship made lighter.
5. No air in space. The interior must contain an atmosphere, with a system that removes excess carbon dioxide and adds oxygen.
7. Insulate well.