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Inner Planets
Mercury Venus
Earth Mars
• Small in size• Made of rock
and metal.• Few
satellites.• Slow
rotation.
Mercury
Mariner 10 probe visits mercury in 1974.
Surface is very much like our moon, full of craters.
Very little gravity, almost no atmosphere.
Greatest temperature changes in solar system: 430ºC ~ -170ºC
Venus Venus is covered by a thick layer of
clouds. Most of the atmosphere is composed of
CO2. Greenhouse effect has raised
temperature to 462°C. Rotates opposite of other planets.
Day is longer than year!!!
Earth
Earth is located in the “Goldilocks Zone” Not too hot, not too cold, just right (for liquid
water). Lots of water, and a thick atmosphere of
oxygen.
Mars Mars has an atmosphere of
CO2, but the atmosphere is very thin.
Temperatures range from 20°C ~ - 140°C.
Evidence of features and erosion caused by water is everywhere.
Some water is in the polar ice caps, atmosphere, and frozen in the ground.
Mars Cont.
Mars is full of extinct volcanoes. Mars’ tilted axis gives rise to seasonal
changes. NASA’s Spirit & Opportunity
Jupiter Saturn
Uranus Neptune
• Large in size.• Made of
Gas(Hydrogen, Helium).
• Rotate rapidly.
• Many satellites.
• Rings.
Jupiter Jupiter is a massive ball of hydrogen and
helium gas. The Great Red Spot is a hurricane 3x’s
the size of Earth and at least 400 years old!
Saturn
Saturn, like Jupiter, is made of hydrogen and helium and is actually lighter than water.
It’s rings are formed of concentric circles of chunks of rock and ice orbiting the planet.
Titan
Uranus
Discovered in 1781 by William Herschel. Uranus is tilted on its side. Has very faint rings. Atmosphere contains methane.
Neptune
Neptune was discovered mathematically in 1846 after it became known that the orbit of Uranus was abnormal.
Has a large perpetual storm called the Great Dark Spot. Triton
Atmosphere of Hydrogen, Helium, Methane, and Ammonia
Dwarf Planets
Small rocky planets located beyond Neptune.
Most are small and very far away and so weren’t discovered until recently.
Asteroids Chunks of rock out in
space. Can be several meters or
kilometers across. May be left over planet.