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 Stars are born from great clouds of gas and dust     They mature, grow old, and die The more massive a star is, the shorter its life A star is a sphere of super-hot gases – mostly hydrogen and helium Vary greatly in their masses, size and density  The range of colors a star emits depends on its surface temperature. Cool stars  redder in color  Stars 3900-7000 degrees C  yellow  Stars 7000-9500 degree C  white  Stars 9500+ degrees C  blue    Diagram that pictures the life of a star Classifies stars based on temperature and luminosity      Majority of stars (about 90%) fall in this category Runs from upper left (high luminosity, high surface temperature ) to lower right (low luminosity, low surface temperature) Life span: 1 million – 1 billion yrs Actively fuse hydrogen and helium Example: our Sun    Closest star to Earth Middle aged star  predicted to keep shining for 5 billion more years Diameter: 870,000 miles wide    If the sun were hollowed, you could fit 330,000 Earths inside Core Temperature: 27 million degrees Fahrenheit Made out of mostly hydrogen  Most stars are red dwarfs     Stars with less than 50% the mass of the sun 1/10,000th the energy of the sun It is estimated there are between 200-400 billion stars in our galaxy The closest star to Earth, besides the sun is Proxima Centauri – located 4.2 light years away  On the fastest spacecraft, it would still take 70,000 yrs to get there    Greater luminosity than main sequence stars Star is moving toward end of life Helium sinks to the center of the core Raises star’s temp.  Outer shell begins to swell     Beginning of star shedding its outer layer Becomes a small, dense body Cools for billions of years and eventually becomes dark and produces no energy    A few stars do not follow the evolutionary path and go out with a bang Violent explosion that leaves behind a small core known as a neutron star If the remnant is large enough = black hole

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Download Stars - BrainBytes