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5/31/11 warm up • What is solar eclipse? • What is lunar eclipse? Solar Eclipse When the Moon moves directly between Earth and the Sun, and the Moon casts a shadow on Earth’s surface. CHAPTER RESOURCES SECTION OUTLINE Lunar Eclipse •When Earth is between the Sun and the Moon, causing Earth to cast its shadow on the Moon. •Can only take place when the Moon is full. CHAPTER RESOURCES SECTION OUTLINE My Very Educated Mother Just Served Us Nine Pies. C11L3 The planets • Planet: a celestial body of moderate size moving in an elliptical orbit around a star. The planets have different sizes and distances from the Sun. inner planets Mercury, Venus, Earth, Mars, outer planets Jupiter, Saturn, Uranus, Neptune, Pluto Inner planets • Are rocky and have craters caused by meteors on their surfaces. Mercury • The closest planet to the sun • Moves around the sun in a highly elliptical orbit • Has no moon • Almost no atmosphere—high daytime temperatures, low nighttime temperature Venus • The second planet from the sun • Similar to Earth in size, mass, composition, and distance from the Sun • Atmosphere mostly carbon dioxide (absorbs infrared radiation emitted by the planets surface and traps heat in the atmosphere) • Period of rotation: 243 earth day • Period of revolution: 225 earth day • A day is longer than its year. Earth • The only body in our solar system known to have life on it. Mars • • • • The fourth planet from the Sun Has a very thin atmosphere Has two moons Collected evidence—water close to the surface of Mars and in Mars’ polar ice caps • No evidence of life on Mars. •Craters cover the surface of Mercury. •Volcanoes shape the surface of Venus. •Erosion changes the appearance of Mars. CHAPTER RESOURCES KEY CONCEPT SUMMARY