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It all started from a speculation, then into the most crucial source. When the universe began after every speck of its energy collide into a very tiny point. This extremely dense point exploded with unimaginable force, creating matter like small particles, dusts, gas, stars, galaxies and propelling it outward to make the billions of galaxies of our vast universe. Astrophysicists name this explosion the Big Bang, and it was started 13.8 billion years ago.

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Hundreds of thousands of years later, electrons stuck to the nuclei to make complete atoms. About a billion years after the Big Bang, gravity caused these atoms to gather in huge clouds of gas, forming collections of stars known as galaxies.

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Galaxies form out of immense clouds of gas that collapse and rotate. As they evolve, stars form within them. Entire galaxies can collide, changing their appearance. Looking deep into space, we see galaxies at earlier stages in their lives, and learn more about their evolution.

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During the development of galaxies, stars and planetary systems typically form.

There are three main theories that explain how stars and planetary systems are born and their formation process.

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It begins with a single star that exhausts or decreases its fuel, experiences a drop in energy, eventually exploding and scattering debris across space. Eventually, the debris collides and forms into large objects like planets and the energy that remains from the dying star forms into a new star and a new system.

The process ends after the formation of the star and the planets are formed into a large elliptical or spherical shape and eventually generate gravity onto the large objects by the cause of its energy and mass and revolve to each other.

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It begins with two stars revolving with each other and colliding, leading to the explosion and debris scattering around. Eventually, the debris collides and forms into large objects like planets and the energy that remains from the dying star forms into a new star and a new system.

The process ends after the formation of the star and the planets are formed into a large elliptical or spherical shape and eventually generate gravity onto the large objects by the cause of its energy and mass and revolve to each other.

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It begins during the process of gasses and dust flowing through outer space, forming a cloud. Then, the cloud of gas and dust contracts or collides with each other due to gravity.

As the clouds form, it starts a system formation between the gas and dust and it starts to heat up and emits light.

As it continues to contract, it forms into a rotating disk and eventually, the debris collides and forms into large objects like planets and the energy forms into a new star and a new system.

The process ends after the formation of the dust and gas contracting to each other due to gravity and energy. As it continues to contract, it forms into a rotating disk and eventually, the debris collides and forms into large objects like planets and the energy forms into a new star and a new system.

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Stars form in molecular clouds, vast regions of gas and dust, through a process that begins when a disturbance, like a shockwave, causes parts of the cloud to collapse under gravity. As the cloud fragments and collapses, it forms dense, hot regions called protostars. Surrounding disks of gas and dust feed material into the growing protostar. When the core temperature reaches about 10 million degrees Celsius, nuclear fusion begins, turning hydrogen into helium and releasing energy. This marks the birth of a star, which enters a stable phase called the main sequence, where it spends most of its life. The mass of the star determines its lifespan and how quickly it evolves.

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9) After Forming into a Planetary System

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9) After Forming into a Planetary System

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Planetary systems are collections of celestial objects bound by gravity, typically consisting of a star and the bodies that orbit it, such as planets, moons, asteroids, and comets. Our Solar System is an example, with the Sun at its center and planets like Earth orbiting around it. Other planetary systems may have different configurations, with varying numbers of stars and planets, and can be located throughout our galaxy and beyond. These systems are essential for understanding the formation and evolution of planets and their potential for hosting life.

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Georges Lemaître was a Belgian priest and astronomer who first proposed the idea of the expanding universe in 1927, suggesting that it began from a single point he called the "primeval atom," which later became known as the Big Bang theory. His work, based on Einstein's theory of relativity, was supported by Edwin Hubble's discovery in 1929 that galaxies are moving away from each other. Lemaître's ideas laid the foundation for modern cosmology and the understanding of the universe's origins.