star and galaxies

star and galaxies
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  • the spectrum have three type just as continuous spectrum:all visible colour emission spectrum: lines of specific colour  absorption spectrum:all visible colour with specific wavelenghts removes forming dark lines 
  • the have various type of stars temperature (hottest >30000 C,cooler<3000C) age(younger stars are hotter than older stars) colour(blue stars are hotter than red stars) brightness(the lower magnitude,the broghter the star) size(red giants are smaller than supergiant) density(the bigger the star ,the lower its density) composition(mainly made up of hydrogen and helium,some stars consist of iron and carbon)
  • the sun is one of many billions of stars seen at night in our galaxy sun is nearly 110 times bigger than earth sun nearest star to earth 
  • structure of the sun : core corona photosphere sunspot prominence flare chromosphere
  • phenomena on the sun surface
  • prominences are immense clouds of glowing gases that erupt from upper chromosphere.
  • effect of sun phenomena on earth:  communication system navigation system and compases satellitesband astronauts power generation global climate  formation of aurorae
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