Sunday, August 29, 2010

Have you seen star ???

  • A star is a colossal, glowing ball of plasma.
  • The star that is nearest to earth is the Sun.
  • Almost all elements that are heavier than hydrogen and helium were created inside the core of stars.
  • The formation of a star begins with a gravitational instability inside a molecular cloud, which is often triggered by shockwaves from supernovae (massive stellar explosions) or the collision of two galaxies (as in a starburst galaxy).
  • Stars are first formed as clouds of gas and dust. In fact, they basically comprise of hydrogen gas.
  • Stars are very hot and give off huge amounts of energy, in the form of heat and light.
  • Stars spend about 90% of their lifetime fusing hydrogen, to produce helium in high-temperature, and in high-pressure reactions near the core.
  • Every star generates a stellar wind of particles that causes a continual outflow of gas into space.
  • Most stars are between 1 billion and 10 billion years old.
  • The oldest star yet discovered is HE 1523-0901, which is an estimated 13.2 billion years old.
  • Huge main sequence stars can have surface temperatures of up to 50,000 K.
  • Stars that have really strong gravity become smaller and smaller with time and eventually, turn into black holes.
  • Stars come in different colors. While hot stars give off blue light, cooler stars give off red light.
  • Some stars are 600,000 times as bright as our sun.
  • All the stars that make up Milky Way Galaxy revolve around the center of the galaxy once every 200 million years or so.
  • Stars twinkle because the light we see coming from them travels through the atmosphere around the earth and there is turbulence in the earth's atmosphere.

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