The Hubble telescope has played a big role into understanding how the cosmos and the planets have been formed. Scientists draw different conclusions and learn something new each day, as they add a new piece to the puzzle of understanding the universe and the Milky Way, where the Earth is located.
According to scientists, stars and planets form from a cloud of dust and gas, found inside another larger cloud, named a nebula. All these particles are being found spread out in the universe and they are a result of the first massive explosion of matter, called the Big Bang.
Ad gravitational fields start to pull these elements in the centre of the cloud of matter, it makes it collapse inside itself, thus making the matter compress, increase in density and turn hotter. This is how the core of a planet forms, thus becoming the hot centre of any newly born heavenly body.
After the matter collapses, gets denser, and it starts to increase its size, the cloud of matter begins to have its own motion, and turns in a certain direction. Its spin direction and algorithm sets out the final shape of the planet. It will get flat, as a disk, or thinner in case it starts to spin. These shapes are called protoplanetary or circumstellar disks. As these small balls or disks of matters start to travel in the universe, they tend to attract the matter around them, thus growing in size. The longer, faster and further such a small objects travels, the bigger the newly born planet becomes.
As it increases in size, it starts to pull out bigger objects into its trajectory, that cannot be integrated into its mass. These are what scientists call moons or satellites, orbiting naturally around a planet, being pulled by its gravitational field, but strong and big enough to avoid being absorbed into the planet’s mass.