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Comets and Asteroids
Transcript of Comets and Asteroids
Chiron Recent discoveries on Asteroids there is a large asteroid belt around the star "vega"
it has an inner warm belt and outer cool belt seperated by a gap.
planets are maintaining the gap
it is just like the asteroid belt between mars and Jupiter.
Jupiter is maintained by the gravity if terrestrial planets and gas giant planets Asteroid 4176 recently tumbled past earth on December 12 2012 Recent discoveries about comets New mineral found in comets
manganese silicide named brownleeite
Disvcovered within an interplanetary dust particle
material was surrounded by many other minerals that also have been reported only in extraterrestrial rocks Famous Asteroids 1904 - Borelli
1847 - D'arrest
1786 - Encke
1900 - Giacoboni
1966 - Hyakutake
1965 - shoemaker-Levx 9
1862 - Swift Tuttle
1867 - Temple 1
1873 -Temple 2
1978 - wild 2 Unique facts about comets Comets were perceived as " long-haired" stars Each comet has a tiny frozen part called nucleus. They are no bigger than a few km across Comets have two tails A dust tail, and a plasma (ionized gas) tail *NASA's stardust mission successfully flew within the nucleus of comet wild 2 collecting cometary particles and interstellar dust for a sample in 2006* Tails can be spotted from earth if it is close enough Properties of an asteroid Physical: • Appear bright ( depending on size and distance) •Come in different sizes and composition • Irregular shape ( because of their low density ) •Shiny •Airless •Rocky •minus 100 degrees F (minus 73 degrees C ) average temperature•greyish•stay unchanged for billions of years Properties of an asteroid Chemical: •rock
•metal Properties of a comet Physical: •Icy •Dust •Nucleus might have a small rocky core.
•Low density •Low temperature Properties of a comet Chemical: •Composed of gases such as carbon monoxide and dioxide, methane and ammonia. •organic compounds •2009, it was confirmed that the amino acid glycine had been found in the comet dust recovered by NASA's Stardust mission. •freezing point 32 °C •Has ions