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Dying Stage of Stars
Transcript of Dying Stage of Stars
by: Kenedi McCormick, Jade Agnew, and Shannon Smith Dying Star Small/Low-Mass Stars Medium-Mass Stars A dying star is a star that no longer has enough hydrogen nuclei (free protons) to sustain the thermonuclear fusion reactions which permit its core to combine four hydrogen nuclei to form one helium nucleus. During the dying stage of small/low-mass stars, less than 1/2 of the mass of the sun consume their fuel at a relatively slow rate. Frequently, these small, red stars may be on the main sequence for up to as much as 100 billion years. Because the inside of low-mass stars never get up to high enough temperatures and pressures to fuse helium, the only energy source that they have is hydrogen. Therefore, low-mass stars never evolve into red giants. Instead, they stay as stable main-sequence stars until they get enough hydrogen fuel and collapse into white dwarfs. White dwarf star. During the dying phase of a medium-mass star, stars that are similar to the sun combine hydrogen and helium at a faster rate. After these fuels are exhausted, they also have the ability to turn into white dwarfs. During their collapse from red giants into white dwarfs, these medium-mass stars cast off their enlarged outer layer, creating a growing circular cloud of gas. The rest of the hot, white dwarf, heats the cloud of gas, which causes it to glow. These circular clouds are called planetary nebulae. These are all examples of planetary nebulae. Large-mass stars have a short life span. There lives end in a fiery explosion or a supernova. It is thought that a supernova is caused by the large star eating away at it's fuel. When in is almost of of fuel the large amount of gravity collapses on the star causing it to implode. This releases a shock wave from inside the star causing a massive explosion. Large-Mass Star An example of a supernova explosion. This particular explosion is a crab supernova explosion. Vocabulary: White dwarf: are the remains of low-mass and medium-mass stars. They're extremely small stars with densities that are greater than any known material on Earth.
Planetary nebulae: spherical clouds of hot gases produced from white dwarfs.
Supernova: a brilliant explosion of stars. The end of large-mass star's lifetime. Members & Responsibilities: Kenedi McCormick: in charge of graphic design + the structure and theme of the prezi.
Shannon Smith: in charge of finding images and videos.
Jade Agnew: in charge of finding research from the textbook, + online sources, and also citing sources. Resources Used: http://science.nationalgeographic.com/science/space/universe/white-dwarfs-article/
http://hubblesite.org/gallery/album/pr2009005a/ Focus Questions What are white dwarfs, and how do they form?
What is planetary nebulae, and how does it form?
What causes a supernova? (The answer to focus questions may be found in this color throughout the prezi.) (Vocab. words can be found in this color throughout the prezi.)