Chapter 23 Earth Science 11

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1 Chapter 23 Earth Science 11

2 Inner planets: Closest planets to the sun A.k.a. terrestrial planets All have a rocky crust, dense mantle layer, and a very dense core Mercury, Venus, Earth, and Mars

3 Outer planets: Furthest away from the sun A.k.a. Jovian planets (Jupiterlike) Larger than terrestrial planets Gaseous and less dense Jupiter, Saturn, Uranus, and Neptune

4 Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune My Very Excellent Mother Just Served Us Nachos

5 Orbits the sun in 88 days Smallest of the terrestrial planets Has impact craters on the surface from huge rocks smashing into it Daytime temperature of more than 400⁰C Nighttime temperature as low as -200⁰C Due to heat radiating away quickly Almost no atmosphere Weak gravity

6 Known as Earth's twin (similar diameter, mass, gravity) Very weak magnetic field Rotates from east to west (not like other planets) Impossible to see surface from earth due to thick pale yellow clouds Made of droplets of concentrated sulfuric acid Most of our knowledge comes from radar-mapping (1991) Landscape has volcanic features, faulting, and impact craters Lava covers about 80% of the surface of Venus Atmosphere is mostly carbon dioxide and 3% nitrogen High pressure atmosphere Surface temperature of about 482⁰C Strong winds of over 300 km/hr

7 Takes 687 days to orbit the sun Weaker gravity than Earth Weak magnetic field Tilt of Mars axis gives Mars four seasons Each season is twice as long as Earth s Daily temperature of 27⁰C Nightly temperature of -125⁰C Atmosphere is about 95% carbon dioxide and 5% nitrogen and argon Has polar ice caps Mostly frozen carbon dioxide and some frozen water Has many extinct volcanoes

8 Takes 11.9 Earth years to complete one orbit Rotates once every ten hours Largest planet in the solar system Twice the total mass of all other planets combined Gaseous surface Consists of alternating light and dark-colored bands that run parallel to its equator Dark bands are areas of sinking gases Light bands are areas of rising gases Wind blows between the bands The Great Red Spot: Rises about 8km above the cloud tops Photographs indicate that the spots may be relatively calm areas that rotate slowly within the turbulent atmosphere Strongest known magnetic field

9 Takes nearly 30 Earth years to complete one orbit Turns on its axis once every 10.7 hours Surface has colored bands (areas of rising and sinking gases) parallel to the equator Has fewer bands than Jupiter Wind speed is faster 1800km/hr

10 Takes 84 Earth years to complete one orbit Not easily visible to the unaided eye Not discovered until 1781 Average surface temperature is about -200⁰C Unusual features: Turns on its axis once every 17.2 hours Orbits the sun on its side (even though the magnetic field is upright) The side of the planet facing away from the sun was no cooler than the side facing the sun

11 Discovered in 1846 Takes 165 Earth years to orbit the sun Rotates every 16.1 hours Wind speeds up to 2200 km/hr Surface temperature of -214⁰C

12 Now known as a dwarf planet (August 24, 2006) Composed of rock and ice International Astronomical Union (IAU) defines a planet as a celestial body which: 1. is in orbit around the Sun 2. has sufficient mass to be a nearly round shape 3. has cleared the neighborhood around its orbit Why is Pluto no longer a planet? Relatively low mass Not dense enough to be terrestrial (inner planet) Not large enough to be Jovian (outer planet) Orbit is on a different plane than the rest of the planets

13 Glowing head and long, bright tail Head glows by reflected sunlight Most of the time, a comet is barely visible even through a telescope Spend much of the time beyond the orbit of Pluto When a comet comes near the sun, solar wind drives particles and gases away - this forms the tail Halley s Comet: Most famous Returns every 76 years (last in 1986)

14 Asteroids: Solid, rocklike masses Most have irregular shape Brightness changes as they rotate Revolve around the sun in the same direction as the planets Most asteroids lie between Mars and Jupiter (asteroid belt) Ex. Ceres and Pallas largest asteroids

15 Meteoroid: Rock or icy fragment travelling in space May be as large as boulders or as small as sand grains Meteor: The light made by a meteoroid as it passes through Earth s atmosphere Light is caused by friction between the rapidly moving meteoroid and the atmosphere

16 Meteorite: Part of a large meteoroid that survives its trip through the atmosphere and strikes Earth s surface 93% are stones (look like dark igneous rocks) Largest known stone weighs about a metric ton (Norton county, Kansas, in 1948) Other types of meteorites are irons or stony-irons.

17 Shooting Star: Visible path of a meteoroid as it enters the atmosphere, becoming a meteor As it enters the atmosphere the meteor burns and vaporizes If the meteor survives the entry and lands on the surface of Earth, it is classified as a meteorite

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