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When a star runs out of gas and how.

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AND THE PLANETS

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California Physical Science textbook

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http://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve/

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//www.enchantedlearning.com/subjects/astronomy/stars/lifecycle/

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http://www.telescope.org/pparc/res8.htmlhttp:\

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SOURCES:

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Only the most massive stars, that have more than 40 times the mass of the sun may become black holes. A black hole is an object with gravity so strong that nothing, not even light, can escape. No light, radio waves, or any form of radiation can ever escape the black hole so it's not possibly to detect one directly.

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After a super giant explodes, some of the material from the star is left behind and that material may form a neutron star. Neutron stars are the remains of high-mass stars and are even smaller and denser then white dwarfs.

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Spinning neutron stars are called pulsars, short for pulsating radio sources. Although they do not actually give off pulses of radiation, but instead emit steady beams of radiation in narrow cones.

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When a super giant runs out of fuel , it can explode suddenly. Within hours, the star blazes millions of times brighter, this explosion is called a super nova.

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PULSARS

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SUPERNOVAS

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PLANETARY NEBULA

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As stars start to run out of fuel, their outer layers expand, and they become red giants. Over time, the outer parts grow larger and drift out into space. This forms a glowing cloud of gas called a planetary nebular

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A blue-white core of a star is left behind a Planetary nebula. It forms when the core
gradually cools and thats how it becomes a white dwarf. They are only about the size of the Earth and have as much mass as the sun

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After a star runs out of fuel, it becomes a white dwarf, a neutron star, or a black hole.

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HOW A STAR DIES

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THE GALAXY

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A STAR

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DEATH OF

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VIDEO

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FUN FACT: The sun is about 4.6 billion years old, so its about halfway through its lifetime.

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Stars with a mass less than the sun can live up to 200 billion years.

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Medium stars live about 10 billion years

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The sun has been lighting our planet for 4.6 billion years and dominates all life on Earth -- but it's a speck in comparison to the other stars in the universe. | For more How the Universe Works, visit http://science.discovery.com/tv-shows/how-the-universe-works/#mkcpgn=ytsci1 Subscribe to Science Channel! | http://www.youtube.com/subscription_center?add_user=sciencechannel Check out SCI2 for infinitely awesome science videos.

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Think of stars like cars, a small car has a small gas tank, but it also has a small engine that burns slowly. While big cars have a large engine that burns quickly, therefore a small car can travel farther on a tank of gas than the bigger car

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How long a star lives depends on its mass. Small mass stars use up their fuel slowerthan large mass star

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After a star runs out of fuel, it becomes a white dwarf, a neuton star, or a black hole.

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A star is born when the contracting gas and dust from a nebular become so dense and hot that nuclear fusion starts

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All stars start off as a part of the nebula. A nebula is a large cloud of gas and dust spread out in an immense volume.

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LIVES OF STARS