Inertia

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Inertia

• An object in motion will stay in motion until a
  force acts against it.
• The more Mass an object has, the more Inertia.
  The harder it is to start/stop it.
• Unless you stop it, a planet will keep flying
  through space forever.

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Gravity

• A force that pulls objects towards each other.
• Gravity pulls the Moon towards the Earth.
• Strength of gravity depends on the Masses and
  Distance between the objects.

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Comets

• -Chunks of ice space dust flying through space
• -in an elliptical orbit around the sun
• -that goes in and out of our solar system
• -can be seen for weeks or months
• -can have a tail that points away from the sun

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(No Transcript)
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http//cse.ssl.berkeley.edu/SegwayEd/lessons/comet
stale/frame_orbits.html
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On April 20, 2007, the comet (Encke) had just
dipped inside the orbit of Mercury, perilously
close to the sun, when a solar eruption struck
and literally tore the comet's tail off. This
surely has happened to comets before, but for the
first time in history a spacecraft was watching.
NASA's STEREO-A probe recorded a fantastic movie
of the collision.
http//science.nasa.gov/science-news/science-at-na
sa/2007/01oct_encke/
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http//www.windows.ucar.edu/tour/link/comets/come
ts.html
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This image of the Hale-Bopp comet was taken on
March 7, 1997. The comet is currently as far away
from the Sun as our Earth is (1 astronomical
unit). The yellow lines show where the comet has
extensive outbursts of dust from its center or
nucleus. This is very unusual because comets
normally don't spew out this much dust at this
distance. The image was taken by H Fukushima, M
Takata, and D Kinshita. National Astronomical
Observatory of Japan
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Asteroids

• Large Chunks of Rock floating in space.
• Not spherical (ball-shaped like a planet).
• Most orbit the Sun between Mars Jupiter
  Asteroid Belt
• 26 asteroids are 200 Km long!
• Most more than 100 Km long!

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Most is empty space. Put all the asteroids
together, they would still be smaller than
Earths Moon.
About 40,000 asteroids are more than ½ mile long!
http//en.wikibooks.org/wiki/WikijuniorSolar_Syst
em/Asteroid_belt
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Stoney asteroid 243 Ida and its satellite Dactyl
(more information and orbit).
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Meteoroid

• Small chunks of Rocks Metals that float around
  in space
• Broken off from asteroids, planets or comets

http//www.solarviews.com/eng/meteor.htm
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Meteors

• Meteoroids that are pulled in by Es gravity
• Burn up when hit Es atmosphere
• We see as shooting stars Meteor Showers
• Can be seen for only a few seconds

http//www.star-bits.com/ID.htm
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http//www.moonglow.net/ccd/pictures/meteors/index
.html
A detailed shot of a meteor, taken during the
Leonid meteor shower in mid-November.
Image Showing Meteors of the Leonid Meteor
Shower, taken from Space.
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Meteorite

• Meteoroid that does not burn up all the way.
• Hits the Es surface.
• Very small, hits very fast.
• Most hit water, some land causes craters
• Craters on Moon from Meteorites

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The Barringer Impact Crater in Arizona, USA. Note
that it is 1.2km in diameter and has a maximum
depth of 183 meters. It was created by a
meteorite of 40 meters in diameter impacting at a
speed of 11 km/second.
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Meteoroid rock still in space (Android in
space)Meteor rock that burns up in Earths
atmosphere(OR it could burn up)Meteorite
rock that lands on Earth (Are you alright?)
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• http//cse.ssl.berkeley.edu/SegwayEd/lessons/Comet
  sTale/com.html
• Comet Game
• http//cse.ssl.berkeley.edu/SegwayEd/lessons/comet
  stale/frame_gallery.html
• Comet history pics