comets, meteor, and asteroids

• celestial visitors have captured the imagination of ancient civilizations. They have thought of bad omens or signs of great change or challenge such ad ishering disasters or wars.
• Comets - made up of ice, rock, and cosmic dust. it follows an elliptical path
• comets are found in Kuiper belt and Oort cloud
• SHORT-TERM COMET - orbital period of less than 200 years. found in KUIPER BELT
• LONG-TERM COMET - Orbital period of more than 200 years, found in the OORT CLOUD
• PARTS OF A COMET -

  1. Nucleus
  2. Coma
  3. Ion tail
  4. Dust tail
• Nucleus - composed of ice, rock and metal; frozen
• Ion tail - composed of charged gases
• Dust tail - composed of very small dust particles
• coma - composed of water vapor, carbon dioxide, dust and ammonia
• Meteors -

  1. meteoroid
  2. Meteors
  3. Meteorite
• meteors - composed of Iron and nickel
• meteoroids - any Natural solid object moving in space
• meteors - enter the earths atmosphere, usually found in mesosphere
• meteorite - landed and found in earths surface
• Meteor colors -

  1. RED - Atmospheric nitrogen and oxygen
  2. ORANGE YELLOW - sodium
  3. YELLOW - iron
  4. BLUE GREEN - magnesium
  5. VIOLET - calcium
• ASTEROIDS - some are called planetoids, solid, rocky-metallic, irregularly-shaped objects
• ASTEROIDS - found beyond the asteroid belt, found along the Jupiters orbit
• asteroids and its compositions -

  1. Carbonaceous (dark C) - Hydrogen
  2. Silicaceous (bright S) - Silicates of Iron and Magnesium
  3. Metallic (bright M) - Metallic Iron