1.  If it has mass, it has gravity!  What does it cause to happen?  Attraction, orbiting  Laws - Newton  More mass = more gravity  Closer together = more gravity  Fall at constant rate  Theories  Why does it exist?  Einstein  Gravitons Gravity http://walrus.wr.usgs.gov/infobank/programs/html/definition/grav.html http://www.universetoday.com/38858/new-way-to-measure-curvature-of-space-could-unite-gravity-theory/

2.  Nebula  Gravity  Mass builds up  Evidence for formation from one nebula  Nearly circular orbits  Orbit in same direction  Orbits in same plane  Planets rotate in same direction (mostly) How does the other stuff form? http://lifeng.lamost.org/courses/astrotoday/CHAISSON/AT315/HTML/AT31502.HTM

3.  Heavier elements  Hotter  Terrestrial planets  Asteroid belt  Effected by Jupiter  May leave and collide with planets  Meteorites What’s happening towards the Sun? http://www.foxnews.com/science/2014/07/24/11-need-to-know-things-about-our-solar-system/

4.  Cooler  Lighter elements  Gas giants  Kuiper belt  Icy chunks  Asteroids  Pluto  Oort cloud  Comets  Source of Earth’s water? What’s happening at the outer edge? http://www.foxnews.com/science/2014/07/24/11-need-to-know-things-about-our-solar-system/

5. You would weigh differently on Jupiter than on Earth! Mass  kg, g, lbs.  Definition  Doesn’t change with location Weight  Newtons  Definition  Can change with location http://pgceandteaching.wordpress.com/2013/06/18/the-difference-between-mass-and-weight/

6.  Astronomical unit (AU)  Average distance from Sun to Earth  1 AU= 9.3 x 10 7 mi = 1.5 x 10 8 km  Calculate the AU distance between the Earth and the Moon 380,000 km Distances within our Solar System

7. 13.How has gravity played a role in the forming of the rest of the stuff in the solar system? 14.If you were on Jupiter, would you weigh more, less or the same as on Earth? 15.If you were on Jupiter, would you have more, less or the same amount of mass as on Earth? 16.Create a way to remember the order of the planets. 17.Create your own definitions for planet, dwarf planet, moon, comet and asteroid. Daily Review #4

8. …what do the scientists say?  Planet 1.Orbit only a star 2.Round 3.Dominant object in its orbit  Dwarf planet 1.Orbit only a star 2.Round 3.Not dominant object in its orbit  Tends to be small  Rocky and icy http://www.windows2universe.org/our_solar_system/dwarf_planets/dwarf_planets.html

9.  Moons 1.Orbit another body  Asteroid 1.Orbit only a star 2.Irregularly shaped  Tend to be small  Meteors – when in our atmosphere Moons and Asteroids http://en.wikipedia.org/wiki/File:Asteroidsscale.jpg http://starryskies.com/The_sky/events/lunar-2003/planets.moons.jpg

10. 1.Ball of frozen gas and dust 2.Orbit only a star 3.Large, very elliptical orbits Comets http://14-billion-years-later.tumblr.com/image/16213560898 http://solarsystem.nasa.gov/planets/profile.cfm?Object=Comets

11.  Orbits the sun once every 90,465 days  Volume is about 1/200 th the size of Earth  Large enough to relatively round in shape  Average surface temperature -229 O C  ~5.9 billion km from the Sun (outside of the gas giants)  Elliptical and angled orbit  Crosses paths with Neptune (which is much larger than this new object) A new celestial body has been discovered! How should this body be classified and why?

12.  Why is it not a planet? 1.Orbit a star?  Yes 2.Round?  Yes 3.Dominant object in orbit?  NO! NO!  What is Pluto? This object is also known as… PLUTO!!!