1. List the phrase & order of the planet from Sun to Space My = Mercury Very = Venus Educated = Earth Mother = Mars Just = Jupiter Served = Saturn Us = Uranus Nine = Neptune Pizzas = Pluto

2. List the phrase & order of the planets from smallest to largest! Probe = Pluto Magellan = Mercury Mapped = Mars V = Venus E = Earth N = Neptune U = Uranus S = Saturn Jupiter

3. Mercury Inner Planet Terrestrial Planet 0 moons 0 rings No atmosphere (burned off by sun) Widest Temperature Range Cratered surface

4. Venus Inner Planet Terrestrial Planet 0 moons 0 rings CO 2 & Sulfuric acid in atmosphere Thick & cloudy atmosphere Greenhouse effect Hottest Planet Retrograde Rotation Twin of Earth

5. Earth Inner Planet Terrestrial Planet 1 moon 0 rings Oxygen & Nitrogen atmosphere 70% covered with Water Life Tilted on Axis Seasons

6. Mars Inner Planet Terrestrial Planet 2 Moons 0 Rings Thin CO 2 Tilted Axis Seasons Iron Oxide (Rust) - Dusty Red Planet

7. Jupiter Outer Planet Gas Giant Many Moons Rings Hydrogen (H) & Helium (He) Largest Planet Great Red Spot

8. Saturn Outer Planet Gas Giant Many Moons Most Rings H & He Least dense planet – could float in water

9. Uranus Outer Planet Gas Giant Many Moons Rings H & He & Methane Blue-green in color Tilted on side (90°)

10. Neptune Outer Planet Gas Giant Many Moons Rings H & He & Methane Blue in color Discovered by mathematical prediction Can switch places with Pluto – sometimes last planet from sun

11. Pluto Outer Planet 1 Moon (Charon) + 2 smaller ones 0 Rings Unknown Atmosphere Scientists reclassified as dwarf planet Known as double planet –Charon is more than ½ its size Like a terrestrial planet

12. Inner Planets vs. Outer Planets Inner Planets Mercury Venus Earth Mars Outer Planets Jupiter Saturn Uranus Neptune

13. Inner Planets vs. Outer Planets Small vs. Large Rocky vs. Made up of Gases 0-2 Moons vs. Many Moons No Rings vs. Have Rings Before AB vs. After Asteroid Belt Varied vs. Mostly H & He atmospheres atmosphere Fast revolu- vs. Slow revolution time tion time

14. Inner Planets vs. Gas Giants In Common: Revolve around the Sun Rotate on axis Elliptical orbits All affected by their own inertia and the sun’s gravity Each planet has its own gravity Shaped the same – like sphere In the Milky Way Galaxy Named after Roman Gods All visited by a Space probe

15. How does Pluto fit in? More like a terrestrial planet Small 1 Moon/2 smaller ones discovered No rings Solid? Not made up of as much gas 1 Theory: Pluto could be a moon that escaped Neptune’s gravity.

16. Why is Pluto a Dwarf Planet? Characteristics of a Dwarf Planet: Orbits the Sun & is not a moon Has enough mass so its gravity pulls it into a sphere Other objects are in its orbital path Smaller than Mercury Other dwarfs: Ceres, Eris, Makemake, & Haumea