As a result, the outside of the star starts to expand and cool, turning much redder. A red giant star is a dying star in the last stages of stellar evolution. There is information on nebulas, protostars, main sequence stars, red giants, white dwarfs, supernovas and black holes. The word life span is different from the life cycle. The amount of mass a star has determines which of the following life cycle paths it will take from there. Red Giant. This time in the life of a Red Giant is very short compared to the main sequence lifetime, only a few million years. The following stage of a star's life cycle involves the hydrogen fuel at the centre of a star to become exhausted causing a shell of nuclear reactions to move outwards into its  atmosphere. Eventually, the hydrogen fuel runs out, and the internal reaction stops. ... A red supergiant is an aging giant star that has … Life Cycle of a Star – Step by Step Explained 1. Stage 5: White Dwarf, Neutron Star or Black Hole. Stars - Life Cycle - Red Giant.. What is a Red Giant?. The following stage of a star's life cycle involves the hydrogen fuel at the centre of a star to become exhausted causing a shell of nuclear reactions to move outwards into its atmosphere. Nebula: a star’s birthplace. This is the middle age of the star. As a result, the outside of the star starts to expand and cool, turning much redder. Also, the temperature inside the cloud is low enough that a molecule can form in it. Giant Gas Cloud. Which of these happens first depends upon the star's mass. Red Giant (in case of a small star) and Red Supergiant (in case of a large star). After burning up it's fuel. However, this stage only lasts for a million years or so, as the helium quickly runs out. Stellar evolution of low-mass (left cycle) and high-mass (right cycle) stars, with examples in italics. A star that has collapsed from the red giant stage to become much hotter and denser than it was. The red giant forms from a main sequence star; hydrogen reduces as hydrogen atoms fuse together. However, all stars roughly follow the same basic seven-stage life cycle, starting as a gas cloud and ending as a star remnant. The image above shows the track a 5-solar mass star can follow across the H-R diagram as it evolves. Betelgeuse is a red giant star in the constellation Orion, one of the most familiar constellations in the night sky. The life cycle of a low mass star (left oval) and a high mass star (right oval). The life span of a star . Once it reaches the Red-Giant-Branch (RGB) phase, the Sun will haves approximately 120 million years of active life left. Whether it was a "massive" star (some 5 or more times the mass of our Sun) or whether it was a "low or medium mass" star (about 0.4 to 3.4 times the mass of our Sun), the next steps after the red giant phase are very, very different. Whether it was a "massive" star (some 5 or more times the mass of our Sun) or whether it was a "low or medium mass" star (about 0.4 to 3.4 times the mass of our Sun), the next steps after the red giant phase are very, very different. When hydrogen fuel at the centre of a star is exhausted, nuclear reactions will start move outwards into its atmosphere and burn the hydrogen thats in a shell surrounding the core. The outer layers begin to expand, cool and shine less brightly. Created by Cade Apple and Jack Dowling. A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses (M ☉)) in a late phase of stellar evolution.The outer atmosphere is inflated and tenuous, making the radius large and the surface temperature around 5,000 K (4,700 °C; 8,500 °F) or lower. The star follows the asymptotic giant branch on the Hertzsprung–Russell diagram, paralleling the original red giant evolution, but with even faster energy generation (which lasts for a shorter time). If the star is massive enough, it will repeat stage 5. A star loses a lot of mass during the red giant stage. This process takes about 10 Billion years. The red giant is the last phase of a stars life. Then forms the Protostar, precursor to the star Main sequence star, or the normal star stage. Once the hydrogen fuel in any star's core is gone, the star essentially leaves the main sequence and evolves into a different "type". Life Cycle of a Star – Step by Step Explained 1. If the star is very massive, it may evolve instead into a red supergiant. A red giant star is a dying star in the last stages of stellar evolution. Massive stars have a mass 3x times that of the Sun. 5. Although helium is being burnt in a shell, the majority of the energy is produced by hydrogen burning in a shell closer to the surface of the star. Eventually the core exhausts its supply of hydrogen and the star begins to evolve off of the main sequence. At various points in a star's life, different things will happen depending on the size of the star. The big difference comes at the end of a star's life. Initially, the cores of red-giant-branch stars collapse, as the internal … The star begins to fuse helium and then increasingly heavier elements to maintain fusion. As they expand, red giants engulf some of their close-orbiting planets. Talk about going out with a bang! Instead, temperatures in the core become hot enough to fuse 3 helium nuclei into carbon, carbon + helium into an oxygen nucleus and so on. The bigger and more massive a star is, the more quickly it uses up its fuel. A star loses a lot of mass during the red giant stage. At that point the star becomes highly unstable and starts to pulsate. Red giant Supernova/Blackhole/Neutron star/White dwarf. And, that's dependent on its mass. Hot, massive blue giant stars spend far less time on the main sequence compared to small yellow stars like our sun - approximately 10 million years as opposed to 10 billion. The star has become a red giant. Also, the temperature inside the cloud is low enough that a molecule can form in it. The helium produced falls onto the core where it can be used as fuel. Talk about going out with a bang! When hydrogen fuel at the centre of a star is exhausted, nuclear reactions will start move outwards into its atmosphere and burn the hydrogen that’s in a shell surrounding the core. The Life Cycle Of Stars: What is the red giant? Towards the end of a star's life, the temperature near the core rises and this causes the size of the star to expand. The red-giant-branch phase of a star’s life follows the main sequence. Towards the end of a star's life, the temperature near the core rises and this causes the size of the star to expand. III. A red giant will lose its outer layers to become a white dwarf. Small sun-like stars move into a planetary nebula phase, whilst stars greater than about 8 times the mass of the Sun are likely to end their days as a supernova. How is it formed? The red giant stage is the first stage of the end of the star’s life. Red Giant to SupernovaMost small Red Giants die as a WhiteDwarf, but the massive Red Giants diein a more spectacular way, aSupernova. * The Hertzsprung-Russell Diagram An H-R diagram plots stars according to their luminosity and temperature (or spectral class) Red Supergiants If the mass of a star is 3 times that of our sun or greater, then the Red Giant will become a Red Supergiant. This lesson defines red supergiants and provides some interesting facts and life cycle information. Over time, the star will change into a red giant and grow to more than 400 times its original size. The temperature in the cloud is low enough for the synthesis of molecules. 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