If you are referring to the 'Big Bang theory' the answer in that theory is, atomic or elemental attraction and gravity . . . in pretty much the same way that clouds in the sky come together to create rain. It is theorized that once the 'weight' of gravity reached a certain point the process became unstoppable, causing all of the gas to collapse, heat, ignite and form a star.
The Sun (and all the planets) started their lives in a giant cloud of cold molecular gas and dust. And then about 4.6 billion years ago, something bumped into the cloud, like the gravity from a passing star, or shockwaves from a supernova, causing the cloud to collapse. With the collapse, the mutual gravity from the particles in the cloud pulled together, and formed pockets of denser material in the cloud. These were star forming regions, and one of them was to become the Solar System.
In order for a clump of matter in a gas cloud to become a star, it must be a whopping BIG gas cloud, so that the mutual gravitation of the cloud would cause it to collapse in on itself. There are some theories that a large and diffuse gas cloud would be unlikely to spontaneously collapse under its own gravity without some substantial shock to the gas cloud. The shock wave of a nearby supernova explosion would not only provide the shock, but also contribute a substantial amount of newly-created heavy elements to the system. Such a supernova five billion years ago probably provided a lot of the iron, gold and uranium to our solar system, and also caused our stellar nebula to collapse, forming our Sun and our planetary system.
The Earth formed about 4.5 billion years ago from a cloud of dust and gas in space, a remnant of the solar system's formation from a nebula. Gravity caused the cloud to collapse, forming the Sun at the center and the planets, including Earth, from the remaining material in orbit around it.
Gravity! Get ENOUGH gas, as light and tenuous as it is, and its own self-gravity will cause the gas to collapse in the center. if there's enough mass, it will get more and more dense, and eventually get hot enough to begin nuclear fusion.
Earth formed about 4.5 billion years ago from a cloud of gas and dust called the solar nebula. Gravity caused the nebula to collapse, forming the Sun at the center and the remaining material to clump together to form planets like Earth.
The Jeans mass is the minimum amount of mass needed for a gas cloud to collapse and form a star. When a sound wave travels through a gas cloud, it can cause the cloud to become unstable and collapse if its mass exceeds the Jeans mass. This collapse leads to the formation of a star.
The process required to allow a gravitationally-collapsing gas cloud to continue collapsing is radiative cooling. Radiative cooling removes thermal energy from the gas cloud, facilitating further collapse under the influence of gravity.
The Sun (and all the planets) started their lives in a giant cloud of cold molecular gas and dust. And then about 4.6 billion years ago, something bumped into the cloud, like the gravity from a passing star, or shockwaves from a supernova, causing the cloud to collapse. With the collapse, the mutual gravity from the particles in the cloud pulled together, and formed pockets of denser material in the cloud. These were star forming regions, and one of them was to become the Solar System.
A star is formed out of cloud of cool, dense molecular gas. In order for it to become a star, the cloud needs to collapse and increase in density.
In order for a clump of matter in a gas cloud to become a star, it must be a whopping BIG gas cloud, so that the mutual gravitation of the cloud would cause it to collapse in on itself. There are some theories that a large and diffuse gas cloud would be unlikely to spontaneously collapse under its own gravity without some substantial shock to the gas cloud. The shock wave of a nearby supernova explosion would not only provide the shock, but also contribute a substantial amount of newly-created heavy elements to the system. Such a supernova five billion years ago probably provided a lot of the iron, gold and uranium to our solar system, and also caused our stellar nebula to collapse, forming our Sun and our planetary system.
Gas
The Earth formed about 4.5 billion years ago from a cloud of dust and gas in space, a remnant of the solar system's formation from a nebula. Gravity caused the cloud to collapse, forming the Sun at the center and the planets, including Earth, from the remaining material in orbit around it.
The sun formed from a large cloud of gas and dust in space about 4.6 billion years ago. As gravity caused the cloud to collapse, it heated up and formed the sun at the center, while the remaining material in the cloud eventually formed the planets in the solar system.
The collapse of a cloud can halt due to forces such as gas pressure, turbulence, or magnetic fields that counteract the force of gravity. Once these opposing forces balance out, the cloud can reach hydrostatic equilibrium and stop collapsing.
This can cause acid rain
Gravity! Get ENOUGH gas, as light and tenuous as it is, and its own self-gravity will cause the gas to collapse in the center. if there's enough mass, it will get more and more dense, and eventually get hot enough to begin nuclear fusion.
Yes, that's correct! The Sun, like other stars, formed from a cloud of gas and dust in space. This cloud is often referred to as a "stellar nursery" or a "solar nebula." Over time, the gravitational forces within the cloud caused it to collapse and condense, forming the Sun at its center. The leftover material in the disk around the forming Sun eventually came together to create planets, moons, and other objects in our solar system.