Fact 1: If gas is heated then that gas will expand.

Fact 2: If more space between 2 galaxies more space to expand so it moves away faster.

Given the two facts above, answer the question "When gas is heated, it takes up more:" with the following options: 
- solutes
 - plasma
 - fluidity
 - energy
 - space
 - viscosity
 - matter
 - Energy.


 

     space    