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									The SUN
The center of our
  solar system.
              SUN Facts
• Closest star to Earth
• Provides both light and heat to Earth
• 1 million Earths could fit inside the sun
• Ultimate source of energy for all life on
• Life as we know it would not exist
  without the sun.
Parts of the sun’s atmosphere
• Core: inner part of the sun; nuclear
  fusion occurs here
• photosphere: surface of the sun; emits
  visible radiation we can see
• Chromosphere: outward from the
  photosphere; where eruptions like solar
  flares and prominences are formed
• Corona: outermost layer of the sun’s
  atmosphere; extends a few million miles
  into space
•   Core
•   Photosphere
•   Chromosphere
•   Corona
Phenomena on the Sun’s
     Activity on the sun’s
      surface affects life
            on Earth
Sunspots- cool spots on
 the sun’s surface. They
can be over 10 times the
   diameter of Earth.
Solar flares: magnetic storms on the sun which
    appear to be very bright spots. They can
  disturb radio communication and affect the
  Earth’s magnetic field. They can also disrupt
     other forms of communication that use
   satellite such as cellular phones, GPS, etc.
Solar flares can cause bright light to
      radiate in our atmosphere.
   Aurora borealis: northern lights
   Aurora astralis: southern lights
              Solar wind
• Continuous streams of electrically
  charged particles that are given ff by
  the sun.
• Solar winds effect the whole
  atmosphere and can cause auroras and
  disrupt electronic communication on
         Solar Prominence
• An arc of gas that erupts from the
  surface of the sun. They can loop
  hundreds of thousands of miles into
     Coronal Mass Ejections
• Huge, balloon shaped plasma burst that
  come from the sun
• They can disrupt Earth’s satellites and
  all satellite related electronics and
  radar as well
    Other objects on the Solar
• Earth’s moon:
  – One of the most visible objects
  – Natural satellite of a planet-a satellite is
    an object that stays in an orbit around a
  – The moon revolves around the sun ever 27.3
• Formerly 9 planets
• Pluto no longer considered a planet,
  because of distance from the sun and
  its composition of ice and gas
• Planets stay in orbit because of
  gravitational pull from the sun
• Terrestrial planets: rocky surface
• Gas giants: gaseous “slush”
• Made of rocks, metal and ice
  A mixture of frozen gases and tiny
particles of dust called “dirty snowballs”
• Also known as shooting stars
• A meteor shower occurs when Earth
  passes through the tail of a comet of a
  cloud of dust left behind by a broken-up
• Objects in space made of gases, which
  produce their own light
• Different stars produce different
  amounts of energy
• The energy produced will determine the
  color and temperature of the star

• Groups of billions of stars
• The milky way galaxy is group of about
  200 billion stars that includes the sun
  and almost all the other stars you can
  see in the night sky.
• 3 different shape galaxies:
  – Spiral (milky way)
  – Elliptical
  – Irregular
• An apparent pattern of stars in the sky
  that form pictures.
• Astronomers have recognized 88
• Ursa major: big dipper
• Ursa minor: little dipper
• Once used by people for navigation and

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