SOLAR SYSTEM

Detailed explanation-1: -Formation. Our solar system formed about 4.5 billion years ago from a dense cloud of interstellar gas and dust. The cloud collapsed, possibly due to the shockwave of a nearby exploding star, called a supernova. When this dust cloud collapsed, it formed a solar nebula – a spinning, swirling disk of material.

Detailed explanation-2: -4.5 billion years ago: Mercury, Venus, Earth, and Mars form.

Detailed explanation-3: -When Earth formed 4.6 billion years ago from a hot mix of gases and solids, it had almost no atmosphere. The surface was molten. As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes. It included hydrogen sulfide, methane, and ten to 200 times as much carbon dioxide as today’s atmosphere.

Detailed explanation-4: -’We can unpick the 4.5 billion year journey from the solar nebula, to the protoplanetary disc, to the solar system we see today. ‘Earth formed from this nebula, so our journey to understand it is also a journey of self-discovery. It lets us understand our own home in space.