1. Planets
6th grade Science

2. terrestrial planets- small, dense, and rocky, like earth.
The Inner Planets
terrestrial planets- small, dense,
and rocky, like earth.

3. Mercury closest to sun one day on mercury is like 59 earth days.
It spins slower on its axis than earth.
the spin of an object in space is called a rotation.
one year is 88 earth days
revolution- the motion of a body as it orbits another

4. Venus very similar to earth
same size, mass, and density
the sun rises in the west and sets in the east
Venus's rotation is opposite of ours.
has the hottest surface temperature of any planet.
the carbon dioxide in the atmosphere traps thermal energy from sunlight…. greenhouse effect.

5. Earth
(if you are confused)
This is where we live 

6. Mars most studied planet, besides earth
Viking 1, Viking 2, and Pathfinder
spacecrafts launched and landed on mars
cold planet (13°c - 77° C)
there is evidence of water on mars in the past, but now there is only ice.
volcanoes- Tharsis and Olympus Mons

7. Gas planets- don’t have any known solid surfaces
The Outer Planets
Gas planets- don’t have any known solid surfaces

8. Jupiter largest planet made of hydrogen and helium
Great Red Spot- a long-lasting storm
five NASA missions
Voyager 1, Voyager 2- sent back images of a faint line around the planet.

9. Saturn second largest planet rings of rock and ice
is made of hydrogen and helium
scientist believe Saturn is still forming!
all gas giants have rings, but Saturn's are the largest.

10. Uranus is made of hydrogen, and methane gas.
featureless- no strong characteristics
tipped on its side.
Scientist believe that a large object hit Uranus and it tipped the planet over.

11. Neptune
has belts of clouds
has a dark spot like Jupiter

12. Pluto smallest planet furthest large moon, Charon made of rock and ice
only planet that has not been visited by NASA