Tuesday, April 12, 2011

astronomy

universe
  • everything that exists
galaxy
  • a lot of stars close together caused by gravitational forces. it is spiral, and stars orbits around center
  • there are more than 170billion in the universe 

star 
  • hot body of gasses
orion
  • scorpio chasing orion (never together)
  • great hunter
great nebula
dark patch

constelation
  • specific region in sky with astronomers breaking the visible sky up to 88 constellations
  • it gives sighns
  • make legends out of constellations
southern cross
  • it is on Australia's national flag
  • seen any time of the year
solar eclipse
  • the moon is 400x smaller than the sun, but about 400x closer 
  • a solar eclipse is when the moon blocks out the light from the sun
  • total eclipse sun is completely blocked out
  • partial- doesn't block whole sun
  • annular- white ring around sun
  • hybrid- between total + annular 
  • lasts a few minutes
Venus 
  • winter- morning star
  • summer- evening star
Solar system

  • Mercury
  • Venus
  • Earth
  • Mars
  • Jupiter
  • Saturn
  • Uranus
  • Neptune
Lunar eclipse
  • it happens because of the earth that gets in between the sun and the moon.
Star
  • a massive luminous ball of plasma held together with plasma
  • sun is nearest star to earth and source of energy of earth
Shooting star 
  • big dust + gas in sky reach the earth's atmosphere it burns out immediately 
 Magellanic clouds
  • part of galaxy 2 small irregular galaxies
  • more like dust
  • look like clouds
  • very colourful
Metoerite
  • solid rock that hits the earth
Milky way
  • our own galaxy viewed from inside
  • have 200billion stars, planets, nebulae, clusters dust + gas + our sun
  • band of light and star clouds that stretch across the night sky
Nebula
  • birth place of stars
  • stars may begin to form as clumps of dust and gas in a nebula are drawn together by their own gravity
Tides
  • rise + fall of all ocean water, resulting from gravitational attraction of the moon and the sun upon the water and earth.
  • at different points of the moon there's different "waves"/gravitational force. 
 
 

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