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Cubangbang #170759

Cubangbang 8th Chapter 6 Stack #170759

Heinrich Olbers found a second minor planet in the gap and called it Pallas
Giuseppe Piazzi found minor planet in 1801 and called it Ceres
minor planets are the same thing as asteroids
Karl Hencke also found a minor planet,in 1845 and named it Astrea
asteriods minor planets were first called
aphelions greater than 1 ua and perihelions less than 1 ua
433 Eros comes within 21 millionkm (13 million mi) of earth
comets often visible without a telescope
Edmund Halley one of the first men to treat comets as ordinary celestial objects
Robert Hooke suggested that many comet sightingsin the past were probably the same comet.
head and tail a comet's two main parts
nucleus and coma the two parts of a comet's head
nucleus contains most of the comet's material
ices rocks, dust, and frozen materials are called
fluoresce to shine the way that fluorescent light bulbs shine
type I tail is pushed away from the sun by the solar wind; mainly dust
type II tail is mainly dust and is pushed away from the sun by the pressure of sunlight
periodic comet if a comet keeps returning, it has an elliptical orbit
Oort cloud some evolutionary astronmers believe that there is a reservoir of comet nuclei in a region surrounding the solar system out to 50,000 ua called this
Kuiper belt a donut shaped region of space beyond the orbit of Uranus
meteoroid a particle of rock or dust in space that orbits the sun
meteor a glowing meteoroid that has entered earth's atmosphere
fireball an extra-spectacular meteor seen by obsevers over a wide area
bolide a meteor that appears to explode or break up violently
train glowing pieces that a fireball left behind them in a trail
meorites meteoroides that fell through the atmosphere that survive long enough to reach the ground
sporadic meteors meteors that come from random directions and may fall at any time
shower meteors meteors that are swept up by earth
Perseids August 12 shower meteors
radiant a constellation that meteors seem to radiate from
Leonids November 17 meteors
Ahnighito the largest meteorite on display at a museum
stones or stony meteorites the most common type of meteorites
Irons second most common type of meteorites
Widmanst├Ątten lines irons when treated with acid
stony-irons about half cilicate and half iron
chrondrules small silicate spheres that can be seen embedded in the iron metal
Barringer Meteorite Crater prob. the most famous crater
Chicxulub found buried in sediments near the Yucatan Peninsula,Mexico in the Caribbean Sea
Created by: bmichaud