Scientists believe that astronauts have to be planters too if they want to live in space for a longer time and accomplish their mission to step on Mars. Experiments were carried out and scientist discovered that it is possible to grow plants in space. An experiment was done in May 2016 which was known as Veggie Plant Growth System in the International Space Station (ISS). Three different types of lettuce were grown in this greenhouse and they were grown in hydroponic medium with LED lights. Astronauts regularly harvested the lettuce and enjoyed salad in space.