Copyright © 2011 InteractiveScienceLessons.com™ Sun 8 planets their 167 moons 3 dwarf planets Asteroids Comets Dust.

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Copyright © 2012 InteractiveScienceLessons.com Sun 8 planets their 167 moons Dwarf planets Asteroids Comets Dust What is a Solar System anyway?
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Copyright © 2011 InteractiveScienceLessons.com™ Sun 8 planets their 167 moons 3 dwarf planets Asteroids Comets Dust

Copyright © 2011 InteractiveScienceLessons.com™ Centimeters Millimeters inches X

Copyright © 2011 InteractiveScienceLessons.com™ 10 mm 20 mm 13 mm mm

Copyright © 2011 InteractiveScienceLessons.com™ Number from 1-9 on a clean sheet of paper Measure the length of your paper __mm Measure the width of your paper __mm Line 1 x line 2 = total area __mm 2 Measure the diameter of a hole __mm π r 2 to get area of circle __mm 2 x 3 (3 holes) __mm 2 Line 3 - line 6 __mm 2 Line 7 X.0014 __mm 2 √ of line 8 *__mm *draw a box with sides this long near the middle hole of your paper

Copyright © 2011 InteractiveScienceLessons.com™ The area this sheet of paper takes up represents all the mass in our solar system The sun’s mass is all but this square In this square is the combined mass of the planets, their moons, and everything else Jupiter and Saturn take up 90% of this box! And so GRAVITY… 1. is the force of attraction between 2 objects 2. causes bodies to revolve around each other 3. increases with mass and closeness Every object exerts a gravitational force on every other object!

Copyright © 2011 InteractiveScienceLessons.com™ Common Examples If you throw a ball into the air, it comes back down When you lose your balance on a ladder and fall When you weigh yourself on a scale Rain falling to earth… Which turns into creeks, streams, then rivers, all flowing downhill People on the other side of the earth are standing in the opposite direction that you are The earth “holding onto” its atmosphere The moon is tugging on you and me right now Stars, though trillions of miles apart, stay together in clusters

Copyright © 2011 InteractiveScienceLessons.com™ This is a gravity switch. What would happen if gravity was switched “off”?

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