Life Cycle Of Stars: The Life Cycle Of A Star

Stars are the most recognized astronomical object in space and they represent the building blocks of galaxies. Stars distribute elements such as: carbon, nitrogen, and oxygen. A star develops from a cloud of hydrogen and helium, the dust clouds that are scattered throughout galaxies. An example of a dust cloud is the Orion Nebula. The gas and dust begin to collapse from its own gravitational pull. As the cloud collapses, the middle gets hotter. This is known as a prostar. A dense and hot core forms which begins to collect dust and gas. All this material may not end up as a part of the star but can become planets, asteroids, comets, or remain dust. A star about the size of our sun can up to 50 million years to mature. The smallest stars are

Main sequence star types include,red dwarves,yellow dwarves,blue giants,red giants,red supergiants.Stars spend most of their lives

Another property of a star is temperature. By measuring the temperature of a star, scientists are able to tell how hot the star is. They use color to measure the temperature of stars. The red ones are the coolest (3,500 K), the yellow ones are warmer (5,000 to 7,000 K), the white ones are warmer still (9,000 to 15,000 K), and the blue ones are the hottest (20,000 to 50,000 K).

Planetary nebula are formed in the outer core of the star that are vanished when the star of the Sun’s mass changes from a red giant to white dwarf. At this stage all the energy from the star fades away losing layers and forms a complex structure.

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.

A star's life cycle is determined by its mass. The larger its mass, the shorter its life cycle. A star's mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust from which it was born. As the interstellar mass condenses and loses gravitational potential energy, the temperature rises and the material gains thermal energy which is known as protostar. It is now a main sequence star and will remain in this stage, shining for millions to billions of years to come. As in sequence star glows, hydrogen in a star’s core is converted into helium, the core begins to contract and heat up. The rapid release energy upsets the pressure-gravity force balance and causes the star to expand, cool down and enter

While the vast majority are of similar class to our sun and bright yellow and white in colour there are also signs of red giants reaching the end of their lives, as well as many small white dwarfs. Perhaps the more puzzling stars are the bright ‘blue stragglers’ (as depicted in the famous Hertzsprung-Russell diagram), as these stars should have expired long ago in explosions called supernova. It has been suggested by astronomers that these stars may be the merging occurring in such a crowded neighbourhood between lower mass

For smaller stars when the nuclear fuel is exhausted and there are no more nuclear reactions opposing gravity the repulsive forces among the electrons within the star eventually generate enough pressure to prevent further gravitational collapse. The star then starts to cool and “die peacefully” comparatively, this type of star is called a white dwarf. When a very massive star about fifteen times the mass of the Sun collapses after it has exhausted its nuclear fuel it explodes as a supernova (currently the largest explosions that are known to take place in space) eventually forming a black hole. [1.1][2]

The first stage in the life cycle of a star is the Nebula. A Nebula is a swirling sea of dust and gas but, it is not a star yet. Over time, the dust and gas will collect into a ball that sweeps through the Nebula. The ball of gas and dust then begins to grow.

Stars a balls of gas that are luminous meaning that they give off light. Star first start transition begins from clouds, a cold molecule of hydrogen that gravitationally collapse creating fragments into many pieces that slowly form in to individual stars. Stars are then held by their own gravity and is made of 75% hydrogen and 25% helium two of the elements in the periodic table. Hydrogen has the symbol of H and is the lightest and also simplest element in the periodic. Helium had the symbol He and had the lowest boiling point compared to the other elements in the periodic table. As time eclipse stars converts elements of hydrogen to helium that is why the ratio of the sum is 70% hydrogen and 29% helium.

The colors of violet, rose, blue, orange, mint green, yellow and many more, make it look like a painting. This nebula with a giant star at its center is known as SBW2007, located in the Carina Nebula. A supernova burns for only a short period of time, but it can tell scientists a lot about the universe. One kind of supernova has shown scientists that we live in an expanding universe, one that is growing at an ever increasing rate. Scientists also have determined that supernovae play a key role in distributing elements throughout the universe. When the star explodes, it shoots elements and debris into space. Many of the elements we find here on Earth are made in the core of stars. These elements travel on to form new stars, planets and everything else in the

Stars are born of gas and dust and have a life cycle based on their original mass. The sun produces energy and turns it into hydrogen into helium. Our sun is a bright yellow star and is made of mostly of hydrogen and helium. The size of the sun is a medium size star in the main sequence. The life cycle of a star is the low-mass (main sequence), medium-mass (giant,and white dwarf) , and High-mass ( supergiant, supernova, and black hole. There are three types of galaxies which are elliptical galaxies, spiral galaxies, and irregular galaxies. We classify stars by their size, color, temperature, and their luminosity. When a star dies it becomes a black hole until millions of years. The hottest star is the blue star the coldest star is the red star.

The inner core has reached its final high density state and the nuclear burning surrounding it increases in intensity. The helium burning becomes unstable and the shell becomes sensitive to changes in temperature and high in pressure, causing explosive flashes. The star’s outermost layers begin to expand and contract as they heat and cool in response to the flashes. Once the star exhausts the remaining fuel at its core, ultraviolet radiation ionizes the surrounding cloud and the star. The result is a planetary nebula, which is a round or oval shape created by the escaping of expanding

The Milky Way contains billions of stars with different ages and sizes. One example of a star which is closest to earth is the Sun. Just like all the other stars the sun is a luminous ball of gas which mostly contains hydrogen and helium and is held together with its own gravity. All the stars produce their own energy by a process called nuclear fusion. Stars life begins in the place what astronomers call the Nebulae. A nebula is enormous cloud consisting of dust and gas; mainly hydrogen and helium. There are three different types of nebulae. The first one is Emission Nebula. Emission Nebulae are usually red and pink in colour because they are filled with hydrogen gas. The Emission Nebula is very hot because of the newborn stars zap there surrounding

Indecent bodies like the sun. Stars are made up of big exploding balls of gas, mostly hydrogen and helium. The sun is similarly a star made up of huge amounts of hydrogen, undergoing a continuous nuclear reaction like a hydrogen bomb. Stars come about when vast clouds of hydrogen, helium and dust contract and collapse due to gravity. The clouds came from astronomical plasma from “The Big Bang”, but the dust comes from the supernovae of other stars.