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2StonyIronmeteorites are made up of about half metal and half silicatesTheir composition suggests that theferentiated planetoidsIronmeteorites contain mostlyFe and some Ni and thege differentia. In this lesson, we are . going to be comparing comets, meteors, and asteroids which are found . in the Solar System. . Essential Question:. What is the difference between a comet, meteor, . and asteroid?. Unit 4. Appearances of comet Kohoutek (1973), Halley (1986), and Hale-Bopp (1997) caused great concern among superstitious.. Comet Hyakutake in 1996. Throughout history, comets have been considered as portents of doom, even very recently: . & Meteors. Lectures will be available at: . homework.uoregon.edu. /pub/. elsa. /. haydock. / . Asteroid Belt Basic . Characteristics. Estimated 1 million are ~1km or larger; millions more are . smaller. Meteorites hit the atmosphere with speeds from 12 to 72 km/. s. .. Earth’s orbital speed is 30 km/. s. and the escape speed from the solar system at the Earth is 42 km/. s. Q: draw a diagram and use it to show why the maximum speed is 72 km/. Comets. one of the most glorious things to see in the sky is a comet.. May be visible for only days, weeks, or months. Comet. : chunks of ice and dust whose orbits are very long, narrow ellipses.. Think of them as a “dirty snowball”. Comets and Their Significance. In the past, people dreaded comets as omens of human disasters such as wars or famines.. Today we know that . comets. are icy members of our solar system that have highly elliptical orbits.. Part 1 . Origin of the elements . Part 2. Geochronometry. : Age of Earth . Formation of Earth and Moon. Differentiation of core and mantle. . Isotope tracing: sequence of events. . What have we learned so far?. I. Comets. A. What is a Comet?: . It is a small body orbiting the Sun that develops a ______ (a fuzzy atmosphere) and/or a ____ as it approaches the Sun. Comet nuclei range from _____________. __________. . Leah Salditch . February 27, 2017. Mars Final Project . 3 main types of meteorites. Iron. Stony-Iron. Pallasite. Mesosiderite. Stony. Chondrites. Achondrites. Pallasite. Achondrites. Basaltic. Common, comprise ~5% of all meteorite findings . shinning universe . there are billions of stars , millions of meteors, . hundreds of stars. , plenty of planets, many moons , a unique sun and many more celestial bodies. . Asteroids. Over 100,000 asteroids.. Vesta is the largest – 330 miles. in diameter.. Size range – 330 miles to about. 100 yards.. Irregular-shaped rocky bodies.. Some asteroids have moon(s).. Chapter 20. A loose collection of ice, dust and small rocky particles. Orbits are very long and narrow ellipses. Comprised of 2 parts: Head and Tail. Originate from either Kuiper belt or . Oort. cloud. .. They have also been called . planetoids. , especially the larger ones. Formation. The most obvious and general thought . “ A Planet would some how been destroyed millions of years and that resulted to asteroid belts ” . . The semi-major axis is represented by a and the semi-minor axis is b.. Therefore, e=0 for a circular orbit..  . Question:. Use the sheet of information below to summarize . the list of planets in order of:.