Supernovae are essential to the universe and are the sources of elements heavier than iron. This material is ejected into space , and some of it falls to Earth as rain.
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A supernova is a powerful explosion that occurs in the final stages of a massive star's evolution or when a smaller star undergoes natural fusion. Supernovas are the largest explosions in space. In a galaxy like ours, a supernova occurs about every 50 years.
There are two main types of supernovae, Type I and Type II , classified according to how they explode. Stars that end their lives as Type II supernovae are extremely massive, typically with a mass eight to fifteen times that of our Sun.
Stars have a life cycle from birth to death, which goes through several stages and lasts billions of years. Before they become Supernova and die, stars go through other stages.
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A star's life begins in a nebula, a collection of dust and gaseous material that includes hydrogen and helium. The next stage is the protostar , and here, the gas and dust material present in the nebula contracts further. Stars usually spend most of their life cycle in the Main sequence. Stars similar in size to the Sun or smaller can evolve into Red Giants, which eventually become unstable and continue to expand. Eventually, the outer layers are blown away, creating an expanding cloud of dust and gas. The outer layers take the form of gas and dust surrounding a heavy, dense core known as a white dwarf.
Stars with a mass greater than eight times the mass of the Sun will follow a different path. When they run out of hydrogen fuel in cores , they will still have enough mass and pressure to fuse helium. A main sequence star slightly larger than the mass of the Sun will begin to fuse helium with carbon, as happens with lower-mass stars.
But when the core runs out of helium, it contracts, heats up, and begins to convert its carbon first into neon, then into oxygen, silicon, and iron. The core then collapses and quickly returns to its original size, creating a shock wave that leads to a supernova. The remaining core forms a neutron star.
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Supernovae eventually fade away, but they leave a remarkable impact on the universe. As a supernova explosion occurs, basic elements such as iron, potassium, neutron, and more are released into space and eventually condense to form new stars – starting the cycle again. Some of the elements that are released will also form planets, like Earth.
