2.  The Sun  4 Inner planets  4 Jovian planets  8 Dwarf planets  30 objects highly likely to be dwarf planets  60 objects which are likely to be dwarf planets  103 objects which are probably dwarf planets  394 objects which are possibly dwarf planets

3.  One of 100 billion stars in our galaxy  The largest object in our solar system.  Contains >99.8% of the mass in our solar system  70% H, 28% He  Energy produced by nuclear fusion

4.  Closest planet to the sun  Named for Mercury, the Roman messenger of the Gods  Similar in size to our moon  Unusual orbit and rotation  Iron-nickel core with silicate mantle

5.  Named for the Goddess of Love  We can see it in the sky  Similar to Earth’s mass and diameter  Thick atmosphere of CO 2 and Sulphuric acid  Very hot 482⁰C (greenhouse effect)  Spins opposite of other planets

6.  Largest of the inner planets  Atmosphere of N 2, CO 2, and O 2  Liquid water helps support life  Crust, mantle, liquid core, solid core  Mantle consists of Mg, Fe, SiO 4  Core consists of Fe and Ni  Not too hot, not too cold!

7.  Named after the Roman god of war  Red in colour (iron oxide, Fe 2 O 3 )  ½ Earth’s diameter  A day on Mars is just 40 min longer than on Earth  Olympus Mons – the largest volcano in the solar system (3x height of Mt. Everest)  Water on Mars (but not as much as Earth)  Locked in permafrost in ice caps

8.  Between Mars and Jupiter  Total mass would equal 10% of Earth’s moon  Ceres is the only dwarf planet in the inner solar system  Indications of a weak atmosphere and surface water

9.  Named after Roman king of the gods  Largest planet  Giant gas ball (H and He)  Solid core of Fe, rock, and H 2 O  61 moons  Huge storms – largest storm is the Great Red Spot (so big, all of Earth could fit in it!)  Very faint rings

10.  Named after Roman god of agriculture  Large and beautiful ring system  Ice with some rocky material  Atmosphere of H and He  Lightest of all planets  30 moons  Titan is a bit larger than Mercury

11.  Named after Greek god of the sky  Coldest planet (-220C!)  Blue-green colour (due to methane in atomsphere)  Tilted axis; spins on its side  One hemisphere almost all day, other almost all night

12.  Named after Roman god of seas  Smallest of gas planets  Strong winds – up to 2000km/h  Also has methane in atmosphere  causes green/blue colour  Atmosphere is H, He, and CH4  Large storms – also has a ‘dark spot’  8 moons (including Tritan)

13.  A dwarf planet is a celestial body that:  Orbits the sun.  Has enough mass to assume a nearly round shape.  Has not cleared the neighborhood around its orbit.  Is not a moon.  The first five recognized dwarf planets are Ceres, Pluto, Eris, Makemake and Haumea.

14.  8 Dwarf planets  30 objects highly likely to be dwarf planets  60 objects which are likely to be dwarf planets  103 objects which are probably dwarf planets  394 objects which are possibly dwarf planets