Star Formation

After a time, the hydrogen runs out almost completely, and it collapses. New reactions begin to take place in the core and these reactions cause the star to expand rapidly. As the stars begin to deplete their new fuel, they switch to others. New elements are formed in the cores of stars but they become too heavy. The star has reached its end growth. When it reaches the end, a tremendous amount of energy is released and it begins to shed its outer layers, the gravity is too weak hold onto them anymore. Once the layers are removed, in the stars place is a fiery core called a planetary nebula. Eventually, the core runs out of fuel and it collapses. This star is now in a very dense state, and is called a white dwarf. Eventually, the white dwarf cools until it no longer shines. This dead star is called a brown dwarf.More massive stars, however, have more violent ways of dying. Some stars turn it into a supergiant. Supergiant stars are extremely bright, and are extremely large. Supergiant stars cores, can collapse violently and suddenly. This collapse causes a tremendous explosion, called a

Soon after the big bang the cosmic dust as well as gases combined and cooled off together to form stars. The nuclear fusion in stars converts hydrogen into helium and is a continuous process in the stars until hydrogen runs out at the core of the star. When hydrogen runs out, helium atoms fuse to form carbon atoms. Massive stars can synthesize heavier elements such as

The main idea for paragraphs 6-8 in When Stars Explode is how stars do explode. Here are some details: according to the text,“But these nuclear reactions do not make as much energy as hydrogen did. Within a few million years, the star has nothing left." The text also said “So the star's center collapses, scrunching itself into a small, dense object. Meanwhile, the star's outer layer shoots into space at millions of miles per hour. The star has exploded!"

The life cycle of a star is dependent on its mass. The larger the mass, the quicker it will die out, whereas stars which are no more than half the size of our Sun can live up to hundreds of billion years. However no matter how large the star is, they all begin their lives in a nursery known as a molecular cloud.

Way out there in space, there are huge clouds of dust and gas and if one of those clouds of dust and gas is massive enough it's own gravity can causes it to start to collapse. When it collapses, it folds itself towards the center of the cloud, then it get denser and denser and hotter and hotter; eventually the particles of that gas and the dust are made up and brought so close together that they start to stick together. Then they start to fuse, thats the energy source of a star. The star switches and begins to shine. Inside every newborn star, hydrogen atoms are fused together to make helium. This process is called fusion and it creates the energy of every star. A star is a luminous sphere of gas producing its own heat and light by nuclear reactions (nuclear fusion).

The larger a star, the shorter their lifespan is, and they explode as supernovae, blasting out powerful shockwaves that create a chain-reaction that spews throughout the galaxy. Within just a few million years, the galaxy is forming stars up to hundreds of times more than a normal galaxy would. When all of the gas available is used up in about ten million years, the galaxy calms down and the period

Type II supernovaes, which are more common, occurs when a star runs out of nuclear fuel and collapses under its own gravity. In a Type II supernovae, once the star’s core surpasses a certain mass (The Chandrasekhar limit) the star begins to impolode. The core then heats up and becomes denser. Eventually the implosion bounces back off the core, expelling the stellar material into space. What’s left is a neutron star.

The life cycle of the star is a long process that has taken place for billions of years and will continue to take place long after our star is no longer in existence. In this essay I will be explaining the magnificent process of how a star is first born till the end of its life cycle. First, I will be explaining how the star is first formed in all its beauty big or small. Then, I will be explaining the path of an average star like our own sun will take. After, I will be explaining the journey of a massive star in all its glory till its destructive end. All stars are first formed in clouds of gas called nebulae, turbulence deep within the nebulae causes cores to form as the mass begins to grow the nebulae begins to collapse upon itself due to

Cassiopeia A Supernova – A Supernova is a star that has exploded and increases in brightness because it’s mass is now ejected.

The deaths of normal stars give birth to neutron stars. Neutron Stars are products of the so called supernova. Supernovae transpire during the death of a highly developed star which occurs when there is not enough nuclear fuel to keep the pressure intact inside the core of a star (Gursky 1975). The aftermath of a supernova is crucial because it frees iron, carbon, copper, and oxygen along with other elements found in a star. This explosion completely demolishes the star and has the ability to transform into either a black hole or neutron star (Freddy 2006). These supernovae are extremely bright and every 200 years there is an explosion that happens to be big enough and bright enough to be seen from earth. Neutron stars are very significant within the universe. It is said that the neutron star was discovered before the before the neutron. It was Lev Landau who first wrote about and studied dense stars. He focused his research on the idea there were objects in the universe that were denser than but as small as white dwarfs and regular stars (Haensel 2007). This focus leads to the discovery of the fascinating and complicated neutron star. The end is only the beginning for neutron stars.

Heavier elements such as iron, magnesium, oxygen, neon, and sulfur remained from the supernova of a star would attract cool gases, dust, and other elements due to its gravity. As a result, this would either create a new planet or a new star.

It is a large bright star with a cool surface. Just like the Sun, it eventually runs out of hydrogen fuel at its center. Red Giants have a diameter of about 10 to 100 times the size of the Sun. The reason for why the Red Giants are so bright is because of its size, although there surface temperature is less hot than the Sun’s. If you were to measure the temperature, it would be about 2000 to 3000oC. Red Giants, very large stars, are also often called SuperGiants. These stars sometimes have diameter of up to 1000 times the size of the Sun, also having more than 1 000 000 times the luminosities of the Sun (Life cycle). These stars live for only a few thousand years to 1 billion years. Eventually the helium in the core runs out and fusion stops. The star shrinks until a new helium shell reaches the

When we think of stars, we often think that they are all the same. We often think that they are all just big balls of gas burning up to billions of light years away. However, that isn't exactly true. The truth is that stars are very diverse. Just like anything else in our Universe, stars fall into many different classifications based on its defining characteristics. In this essay I will discuss several different types of stars.

Supernovas are the explosion of a star when it reaches the end of its life. There are two ways a star can go supernova. The first way or a Type I supernova occurs in the Binary system which is when two stars orbit the same point. The two stars are a white dwarf and a red giant. A white dwarf is a small dense star that is around the size of a planet and a red giant is a star at its last stages of life. If these two stars are close enough, matter will be transferred to the white dwarf from the red giant. When the star’s core reaches its limit of matter, a thermonuclear detonation will occur leaving nothing behind unless there were leftover elements in the white dwarf or there were elements made in the supernova explosion. One of the elements made in the explosion is radioactive nickel.

Main sequence stars like our own sun enduring in a state of nuclear fusion during which they will produce energy for billions of years by replacing hydrogen to helium. Stars change over billions of years. When their main sequence phase ends they pass through other states of existence according to their size and other characteristics. The larger a star's mass, the shorter its lifespan is. As stars move toward the end of their lives, much of their hydrogen will be converted to helium. Helium sinks to the star's core and raises the star's temperature—causing its outer shell to expand. These large, puffy stars are known as Red Giants. The red giant phase is actually a prelude to a star shedding its outer layers and becoming a small, dense body called a White Dwarf. White dwarfs cool down for billions and billions of years, until they finally go dark and produce no energy at all. Once this happens, scientists have yet to observe, such stars become known as Black Dwarfs. A few stars avoid this evolutionary path and instead go out with a bang, exploding as Supernovae. These violent explosions leave behind a small core that will then turn into something called a Neutron Star or even, if the remainder is large enough, it is then turned into something called a Black Hole.