2Universe / Gravity Recap Which planet has the lowest gravity?Pluto (Dwarf Planet)Which planet has the highest gravity?JupiterOn which planet were you the “lightest”?PlutoOn which object were you the “heaviest”?Neutron StarWhy do you think you were the heaviest on that object?It has the most gravity
3Universe / Gravity Recap Define massHow much matter an object containsDefine WeightForce of attraction between you and the EarthWhat does the force of gravity depend on?Your massMass of the Planet you’re onDistance from the center of the planetWhat equation can we use to determine the force due to gravity?F = Mmr2
4Universe / Gravity Recap Between mass and weight which one changes depending on which planet you’re on?Weight. Mass stays constant but weight depends on gravityWhy did you have to jump 5 times?To eliminate any experimental errors
5Universe / Gravity Recap On which moon/planet could you jump the furthest?MoonOn which planet would you jump the shortest?JupiterWhy would you jump the shortest on that planet?It has more gravity so you would be “weighed” down.
6Objects in the Universe PlanetsMoonsSmall Bodies in solar system with weak gravity and no atmosphereDwarf PlanetsCometsAsteroidsMeteoroids
7What is a planet? A planet is a celestial body that (a) has sufficient mass for its self-gravity assumes a nearly round shape, and(b) is in orbit around a star, and is neither a star nor a satellite of a planetBut with this, Pluto should be a planet.
8Theory changedA planet is a celestial body that(a) has sufficient mass for its self-gravity assumes a nearly round shape, and(b) is in orbit around a star, and is neither a star nor a satellite of a planet, and(c) has cleared the neighborhood around its orbitIs pluto a planet then?
9Objects in the Universe PlanetsMoonsSmall Bodies in solar system with weak gravity and no atmosphereDwarf PlanetsCometsAsteroidsMeteoroids
10Dwarf Planets Orbits sun Not enough mass to clear items out of orbit Has own gravityNot enough mass to clear items out of orbit5 Dwarf planets
11Comets Small body of ice, rocks and dust “Dirty Snowballs” Gives off dust and gas in form of a tail when it gets close to the sunTail always points away from the sun
12Asteroids Asteroid Belt Hundreds of thousands of asteroids Small, irregularly shaped, rocky objectMost are located between Mars and JupiterAsteroid BeltHundreds of thousands of asteroids570km to 4 m in diameter
13Meteroid Rocky Body that varies in size. Smaller than asteroid Enters Earths atmosphere and can become either a meteor or meteoriteMeteor: Bright streak of light. Meteroid burns up as it enters atmosphereMeteorite: Meteroid that reaches Earths surface and doesn’t burn up