Wednesday, December 7, 2011

Stars and Constellations

  • star-sphere of hot gasses gives off light and heat
  • only star you can see in daytime is the sun
  • sun is average size star, closest star to earth
 
  • cooler stars are red or orange, hotter stars are white or blue
  • sun is 5 billion years old
  • light year-distance light travels in 1 year (10 trillion km)
  • a star you see today may have stopped glowing many years ago, but the light is still traveling to earth
  • galaxies-stars found in large groups
  • our galaxy is the Milky Way
 
  • many galaxies may be undiscovered
  • our closest neighbor galaxy is Andromeda
  • constellation-group of stars that make a pattern in the sky
  • some stars and constellations only appear in the northern or southern hemisphere of earth, it depends on where you look at the constellation from on earth
  • as the earth travel in it's orbit, you see different constellations
  • before clocks and satellites, farmers used the stars to tell seasons
  • the north star is always in the northern sky
  • an observatory is a place you can go to watch and study stars
  • sun is made of layers also 
  • much of the suns energy is released as heat and light
  • producers use the sun's energy to make food for themselves and consumers
  • sun's heat makes water evaporate (turn into gas or vapor)
  • sun drives winds, ocean currents, storms
  • sun's light and energy can cause damage to the eyes and skin, even on cloudy days

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