orbiting around our Sun we find asteroids comets and planets with their moons but how did our solar system form around 4.5 billion years ago a cloud of mostly hydrogen gas and gas started to collapse onto itself it's fun faster and faster flattening out to form a disk with a bent Center this Center got so hot it started making light and our Sun was born around our baby son there was still a spinning disk of gas and dust over time it cooled and came together dews and magnetism and gravity closer the Sun metals and rocks began to form but it was still too hot for other materials to become solid they remained as gases further from the Sun where it was cooler water and other ices could form they came together to make larger pieces called planetesimals which then joined to make large planets these planets had enough gravity to capture the surrounding gas and became the gas giants Jupiter and Saturn some scientists think Jupiter formed first and was pulled in towards the fan by the swirling material in the inner disk when Saturn formed it moved inwards to the planets got closer and swept up the gas between them they then began to journey outwards together Jupiter's large size stopped rocky material clumping together the asteroid belt is full of these rocky scraps of the solar system it might also explain why Mars is smaller than expected when Jupiter moved inwards it fed on lots of material so later Mars had less to form from in the inner solar system chunks of metal and rock only came together to create the rocky planets within 100 million years early planets were orbits the Sun with lots of leftover material in between the young Sun had a phase of releasing strongly it blew the extra pass outwards stopping the rocky planets and early gas stars from growing the pout with moving gaps are pulled in around the snowball cause of the ice giants Uranus and Neptune in the outer solar system many of the leftover ice bees flew out into the spare to Oort cloud the occasionally got from inwards glowing comets and color I did with the rocky planets comets poor ices and gases back to these planets providing material for their axes and also bringing water to the earth for the first billion years many stray pieces of rock and ice would have been flying around creating lots of collisions the Earth's moon could be the result of a large object impacting the earth similar impacts may have reverse Venus's spin and knocked uranus onto its side some of the planetesimals still floating around were captured by the giant planets two full moons around them scientists are looking to distant stars with exoplanets to see how faith may be then we'll know if we truly live on a unique planet in a very special solar system [Music] [Laughter] [Music]