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Stars: Birth, Life and Death

Stars: Birth, Life and Death. There are 3 types of stars that you need to be familiar with... Low Mass stars Intermediate Mass stars High Mass stars . Also known as Red Dwarf Stars Characteristics... Start and stay relatively small Exist as dim, cool red dwarfs

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Stars: Birth, Life and Death

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  1. Stars: Birth, Life and Death

  2. There are 3 types of stars that you need to be familiar with... Low Mass stars Intermediate Mass stars High Mass stars

  3. Also known as Red Dwarf Stars Characteristics... Start and stay relatively small Exist as dim, cool red dwarfs Burn hydrogen fuel very slowly, lasting up to 100 billion years 1. Low Mass Stars

  4. Method of Death/Burn Out Eventually become very hot (but small) dim, white dwarfs and quietly burn out Sirius B 

  5. Example: our Sun Characteristics... Burns hydrogen fuel faster than low mass stars, lasting about 10 billion years Expands into a red giant after a long period of stability 2. Intermediate Mass Stars

  6. Method of Death/Burn Out • Red giant sheds most of its material into space • Collapses in on itself, becoming a small, dim, white dwarf • Keeps cooling until it becomes a black dwarf • a dense, dark body made up of mostly carbon and oxygen

  7. Characteristics... 12+ times the mass of our Sun Burn fuel faster than the other 2, lasting about 7 billion years Become supergiants when they’ve used all their fuel 3. High Mass Stars

  8. Method of Death/Burn Out • Supergiants collapse on themselves, forming supernovas • There are 2 possible endings from there: • Neutron Star • Black Hole Cassiopeia A 

  9. Neutron Stars Remaining core of supernova will eventually collapse on itself, forming a neutron star Neutron Star: (average) starts out more than 1 million km across but collapses into a sphere only 10km wide

  10. 2. Black Holes • Happens to stars 25+ times the size of the Sun • Called black because nothing (not even light) can escape it • so dense that it creates a massive gravitational pull

  11. Evidence: • materials pulled towards black holes emit electromagnetic radiation, which can be measured • Gravity from black holes effects passing stars/galaxies • Computer models show how it can distort light from distant stars

  12. Stars can vary greatly in size Although our Sun is an average size, many of the stars we see in the night sky are up to 3000 times as large as the Sun. Star Sizes

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