Question

astronaut chris hadfield directly benefited from the new equipment when he lived on the international space station in 2013. this change helped hadfield stay strong during his time in space. the international space station astronauts time the new equipment helped hadfield stay strong during his time in space.

Explanation:

The text mentions that the new equipment directly benefited the astronaut and this change (the new equipment) helped him stay strong. So, "this change" refers to the new equipment.

Answer:

The new equipment