CLEAN : Moon and Mars veggies grow in Dutch greenhouse

The video tutorial discusses the challenges of using real lunar and Martian soil for experiments, leading to the use of NASA's substitute soil. The experiment involves planting various species, including potatoes, due to their nutritional value. Conducted indoors, the experiment simulates conditions on Mars and the Moon, where harsh environments prevent outdoor growth.

Why is it necessary to conduct the plant growth experiments indoors?

What conditions are controlled in the indoor environment for plant growth?