Small Bodies in the Solar System 20-3 pgs. 557-561 5/15/14 IN: List the 8 planets in order starting...
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Transcript of Small Bodies in the Solar System 20-3 pgs. 557-561 5/15/14 IN: List the 8 planets in order starting...
Small Bodies in the Solar System
20-3 pgs. 557-561
5/15/14
IN: List the 8 planets in order starting closest to the sun.
Put you DRW on the box
• Mercury Inner Planets• Venus terrestrial• Earth -small, dense,• Mars and rocky
• Jupiter Outer Planets• Saturn gas giants• Uranus -large and made• Neptune mostly of gas
Asteroid Belt
• Asteroids – large chunks of rock that orbit the Sun.
• Sometimes referred to as minor planets.
Asteroid Belt – the region of the solar system, between Mars and Jupiter, where asteroids orbit the Sun.
Comets
• Comets – a small body of ice, rock and cosmic dust loosely packed together.
The Tail of a Comet• A comet’s ion tail consists of electrically
charged particles of dust and gas.
Halley's Comet last appeared in the inner Solar System in 1986 and will next appear in mid-2061.
Halley's Comet is the most famous of the periodic comets and can currently be seen every 75–76 years.
(You don’t have to draw this.)
Meteoroid, Meteorite, or Meteor?• Meteoroid – a very small, rocky body
that revolves around the sun.
• Meteor – the bright streak of light caused by dust burning up.
• Meteorite – a rock that reaches the Earth’s surface without burning up completely.
A “shooting star” is NOT an actual star.
Meteor Showers
Meteoroids and the Moon
Meteorites and the Earth
Objects smaller than about 10 m across usually burn up in the atmosphere.
Meteor Crater• The crater was created about 50,000 years ago.• The object that excavated the crater was a nickel-
iron meteorite about 50 meters (54 yards) across, which impacted the plain at a speed of several kilometers per second (28,600 mph).
•OUT: What would result if a meteorite struck the Earth?