Asteroid Belt Kuiper Belt Oort cloud

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Presentation transcript:

Asteroid Belt Kuiper Belt Oort cloud

Asteroid Belt Discovered in 1801. Piazza found Ceres. Olbers found Pallas. Previously predicted by Franz Xaver VonZach.

Asteroid Belt The region of space between Mars and Jupiter; about 2.8AU Hundreds of thousands of asteroids known. Probably millions.

Asteroid Belt 3 types of asteroid: Carbonaceous, Silicate, Metallic Even the largest object in the belt, Ceres, is too dim to see without aid

Asteroid Belt Remnants of a planet-formation process that failed

Kuiper Belt Discovered in 1992 Named for Dutch Astronomer Gerard Kuiper, who had PREDICTED its existence in 1951.

Kuiper Belt Region beyond Neptune; 30 to over 50AU At least 70 000 small, icy, slow-moving, objects

Kuiper Belt Very faint objects because small, far and reflect light from Sun A million times fainter than faintest we can see with naked-eye

Kuiper Belt History of solar system

Oort Cloud Hypothetical spherical cloud. No direct observations. Proposed by Ernst Opik (1932), Jan Henrik Oort (1950)

Oort Cloud 50 000AU; defines gravitational boundary of solar system Source of long-period Comets

Oort Cloud Objects composed of ices (water, methane, and ammonia) 2 regions: outer sphere, inner disc

Oort Cloud Comets can not have formed on their current orbit Must be held in an outer reservoir

Sources http://www.lpl.arizona.edu/faculty/malhotra_preprints/ISP_Nov04/KuiperBelt.jpg http://www.cnes.fr/automne_modules_files/standard/public/p1135_ed77069b38b89947b9f6e5678e9af2adkuiper_pluton.jpg http://discovermagazine.com/2004/nov/cover/outer-oort.jpg http://www.myastrologybook.com/OortCloud10q8x7.jpg http://en.wikipedia.org/wiki/Oort_cloud http://en.wikipedia.org/wiki/Ceres_(dwarf_planet) http://www.astro.ubc.ca/~lallen/kbo/general.html http://www.enchantedlearning.com/subjects/astronomy/solarsystem/kuiper.shtml Universe: The Definitive Visual Guide

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