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Published byEzra Young Modified over 9 years ago
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Small, have rocky surfaces Terrestrial Planets: meaning earth
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closest to the Sun Interior is made up of iron and nickel metals So close to the sun that people can’t get a good view of it. Only half of Mercury has been photographed Many flat plains and craters
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Thin/No atmosphere Gases where once heated so much they moved so fast they escaped Mercury’s atmosphere Greatest range of temperature of all planets
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Nearest planet to sun Our moon and Mercury’s surface look alike (craters) No atmosphere No moons Revolves around sun with same side always facing sun Greatest range of temperature (662°F=day, -274°F=night)
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Earth’s twin (similar in size) If you see a bright object in the west after sunset it is most likely Venus Venus’s Rotation Takes 7.5 Earth months to revolve around sun 8 months to rotate on axis Day is longer than Year Rotates east to west (clockwise) unlike most planets Retrograde rotation: moving backward
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Atmosphere so thick it is always cloudy No sunny days If you stood on Venus you would be crushed. Atmosphere is so strong Greenhouse Effect: trapping of heat by atmosphere
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19 spacecraft have visited 1 st only last 23 minutes before it was destroyed Rocky areas, volcanoes with lava flows, craters, strange domes
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Second planet from sun Spins slowly backwards as it orbits Atmosphere made mostly of carbon dioxide Hottest planet (860°F) Surface: craters, mountains, volcanic lava flows. No moons Day is longer than year
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3 rd planet from the sun 70% water, 30% land 1 moon Conditions necessary for life Has volcanoes and earthquakes Three layers Crust: solid rocky surface Mantle: hot molten rock Core: inner solid, outer liquid
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Red planet: looks slightly red in the sky You could walk on Mars but would need airtight suit and oxygen tank Frozen ice at each pole Has season’s just like Earth
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Giant volcanoes but probably not active Red rock from rusty dust No oceans or water now Was water millions of years ago
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Has two moon’s Phobos: 27 km in diameter (distance car travels on highway in 15 minutes Deimos: 15 km Covered with craters
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4 th planet from sun Rust causes surface to have a red glow Polar ice caps at each pole Two small moons (covered in craters) Thin atmosphere Huge dust storms cover surface at times Has seasons Volcanoes No water now Day=25 hours Year=686 days
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