Our next threshold is threshold 4 “Earth and the Solar system” which is important because we live in planet earth and without earth where would we be. The ingredients for this threshold is new chemical elements,cloud of chemically rich matter, and newly forming stars. The perfect conditions were environments where elements gather, combine and form chemical bonds or in other words gravity, accretion and random collisions. According to the video “ The Sun: A brief Big History” the sun played a key role in shaping the Earth because the Earth was made by the leftovers of the Sun. The new complexity being formed would be astronomical bodies more chemically rich than stars such as our sun which include planets, comets, asteroids and also more complex structures such as our solar system.