PPT-Meteorites:

Introduction to methods Identification and classification EL YAZIDI Mayssa Le 31032016 Kélibia Plan Introduction Terminology Origin Identification criteria Classification. -2-Stony-Ironmeteorites are made up of about half metal and half silicates.Their composition sug-gests that theferentiated planetoids.Ironmeteorites contain mostlyFe and some Ni, and thege differentia 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: . 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/. Asteroids. Composition (what are they made of?. Asteroids are rocky worlds.. Asteroids. Where are asteroids found?. Most asteroids orbit the Sun between Mars and Jupiter.. Asteroids. What are their shapes?. large stony meteorites, which have much lower compressive strengths than irons (Popovaet al., 2011) can survive atmospheric passage without fragmenting (Borovicka andSpurny, 2008). The best, most rece 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..    \r\f\n Overview Students will understand where meteorites come from, what they are made of, and what they tell scient 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 . Meteors. Meteorites. Impacts. Meteors, Meteorites and Impacts. I. . Small . Solar System Bodies. Small Solar System Bodies. (SSSB, as defined by the IAU) are objects in the Solar System that are neither . Geochronometry (methods). Nuclear synthesis. Meteorites. Age of the Earth accretion. Pb . Formation of the core . Formation of the core (energy considerations). Formation of crust. Plate tectonics starts. Over 500 color images and engaging text provide insight into these interesting collectibles from out of this world. Meteorites link back to the early stages of the Milky Way galaxy and are the oldest items one can touch, some dating back to before the creation of our solar system. Meteorites are also among the most primitive forms of matter you can closely observe and handle. Some of these ambassadors from the void were created in stars that no longer exist. Others provide the curious researcher with original material from the earliest days of our own solar system. These rocks tell tales to those who know how to read them of nebulas, novas, supernovas, red giants, and impacting celestial bodies. Readers can explore metallic, stony-iron, and stony meteorites, meteorite falls, Northwest African meteorites, and rare meteorites. The authors trace the formation and breakup of the planets, asteroids, and comets where meteorites originated, their long journey through space, their fall to Earth, their recovery, and what scientists are learning from them. The book contains a great deal of material about the “84001 Martian meteorite,” which has raised provocative new questions about life on the red planet. Looking forward, the authors chart the exciting new era of planetary, asteroidal, and cometary exploration planned for this century. A complete visual reference for meteorite classification, this atlas combines high resolution optical microscope images with detailed descriptions. It provides a systematic account of meteorites and their most important classification parameters, making it an essential resource for meteorite researchers. Each chapter starts with a description of the meteorite class, with a summary of the mineralogical, chemical and isotopic characteristics of the group. The full-color images are taken in plane- and cross-polarized light and reflected light, and arranged to highlight textural variations in meteorites. Specimens are grouped to show the effects of increasing thermal alteration and shock, as well as variations in chondrule size and type. Chapters on iron meteorites, pallasites and mesosiderites are included, photographed as mounts in reflected light, to show the range of textural variations that accompany these meteorites. Images from the book can be downloaded from www.cambridge.org/9780521840354. Small Solar System Bodies. Did you find a meteorite?. Credit: Public domain. Did you find a curious looking rock? With the help of these instructions you can investigate . if it could be a meteorite..