Pros
Exploring the unknown
Developing technology
Testing and experimenting with unknown aspect in physics -
Creating new theories
Cons
Other issues are more important
Can be a waste of money if theories can be validated
There are dangers and risk that are unknown in space
Hope it helps
Here it goes:
Factories weren't easy back in the days. They were packed with workers working as hard as they could to have some food on the table when they got home. I was one of them. Factories were dirty, machinery wasn't as efficient and the environment wasn't very friendly. All we did for hours and hours was stacking, separating boxing, etc. Many people were ill and others exhausted.
Hope it helped,
BioTeacher101