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2. The Inner Planets
 Terrestrial
 High temperatures
 Closer to the Sun
 Closer to each other

3. Mercury  Closest to the Sun
 Only 88 days to orbit
 Many craters
 Temperature extremes
 400C during day, -180 at
night
 Basically no
atmosphere
 Named after the
Roman messenger of
the gods.

4. Mercury
 Second densest object
in the solar system.
 Mercury is not the
hottest planet even
though it is the closest
to the Sun
 It rotates on its axis
one and a half times for
each orbit around the
sun.

5. Venus
 Named after the Roman
Goddess of Love
 Earth’s sister planet
 Morning and evening star
 Thick atmosphere of CO2
and Sulfur
 Longer day than year
 Spins opposite than other
planets
 Over 500C all the time

6. Venus
 The atmosphere of
Venus contains a high
percentage of carbon
dioxide that holds heat
in the planet's
atmosphere.
 The atmosphere of
Venus is made of thick
clouds of sulfuric acid
and carbon dioxide,
which makes it very
hot.
 Hottest planet in solar
system

7. Earth  Home sweet home
 Only planet with
sustained life
 Hydrosphere (water)
 Atmosphere made up
of N, O, CO2
 Comfortable
temperature

8. Earth  Earth has fewer craters
than other terrestrial
planets because of its
atmosphere (upper)
which destroys
meteorites.
 Its atmosphere is called
a secondary
atmosphere.

9. Mars
 Named after the
Roman god of war.
 Frozen polar CO2 caps
 Smaller than Earth
 Slightly longer day and
year
 Very cold

10. Mars  Thin atmosphere
 Largest mountain in
solar system
 Olympus Mons
 Mars has frozen polar
ice caps and is known
as the most like Earth.

11. Asteroid Belt
 Separates the inner
and outer planets
 Possibly an annihilated
planet
 Most asteroids hang
out here

12. Outer Planets
 Gas giants
 No solid surface, just thick atmosphere
 All very large
 Very far apart from each other
 All have rings

13. Jupiter
Named after the Roman
king of the gods
Could hold 1300 Earths
Almost big enough to be a
star
12 EY = 1 Jovian year
1 Jovian day = 12 EH
Huge storms
 Great red spot “hurricane”
larger than Earth

14.  Some moons may have
water
 Jupiter is largest planet
in the solar system.
 Jupiter can fit all of the
other planets inside
this gas giant and there
would still be space left
over.

15. Great Red Spot
 Caused by winds
spinning in
opposite
directions on the
surface –
essentially a
permanent
hurricane.
 About 3 times the
diameter of
Earth.

16. Saturn
 Named after the
Roman god of the
harvest
 29 years to orbit
 Large rings made of ice
and dust
 10 hour day
 Possibly still forming
 Tilts itself

17. Saturn  Saturn is known for its’
rings and is the least
dense planet. It would
float in a swimming
pool if we had one big
enough to put this
planet into.

18. Uranus
 Named after the
Roman god of the sky
 Blue in color due to
methane gas
 84 years to orbit
 Rotates sideways
 Very cold
 -250C

19. Uranus
 Uranus also has
rings, but lies on
its side so the
rings go around
it vertically.

20. Neptune
 Named after the
Roman god of the sea
 Methane atomosphere
 164 years to orbit
 -250c temps
 30 times farther from
the sun than Earth

21. Neptune
 Neptune is
blue because
it is mostly
made of a gas
called
methane

22. Neptune’s Blue Spot
 A storm as
large as Earth
 Similar to
Great Red
Spot of Jupiter

23. Pluto
Pluto is not a
planet, because of
its size and
irregular orbit.