PLUTO AND SOLAR SYSTEM DEBRIS CHARACTERISTICS OF PLUTO
PLUTO AND SOLAR SYSTEM DEBRIS
CHARACTERISTICS OF PLUTO • ____ the size of Earth. • Most of planet is thought to be rock and ______ ice. • The surface has a layer of methane ice. • Very thin methane atmosphere when ice melts. • Has density of 2. 1 g/cm 3 • Earth is 5. 51 • Its orbit occasionally crosses ____ and is _____.
PLUTO’S ORBIT
PLUTO ISSUES • Because of the following issues, scientists began to question whether Pluto was in fact a planet. • Inclined orbit • Orbit crosses Neptune’s • Composition closer to that of Jovian _____ • Significantly _____ than nearby planets
WHY IS PLUTO CONSIDERED A DWARF PLANET? • Pluto did not ______ the neighborhood around its orbit. • A planet should have had enough ______ to pull in all the surrounding material during solar system formation. • Pluto is just one of ______ rocky/icy bodies in the Kuiper Belt. https: //www. youtube. com /watch? v=BKo. Rt-6 pj. AE
SOLAR SYSTEM DEBRIS • There are 3 types of solar system debris: • _____ • Comets • _____
WHAT IS AN ASTEROID? • An asteroid is a large rocky body that orbits around the Sun, but are smaller than planets. • They vary in size from ____ of meters up to ______ (Ceres) km in diameter. • Most asteroids are found in the Asteroid Belt located between _____ and _______.
ASTEROID CLASSIFICATIONS • 3 main types of asteroids: 1. C-type : _____, usually grey in color, 75% of asteroids 2. S-type: _____, usually greenish to reddish in color, 17% of asteroids 3. M-type: ____, usually reddish in color, 8% of asteroids
EARTH-CROSSING ASTEROIDS • Earth-crossing asteroids are asteroids whose path around the Sun crosses Earth’s orbit. There are 2 major groups of Earth-crossing asteroids called ____ and Atens. • Atens spend most of their time ______ Earth’s orbit
WHAT IS A COMET? • A comet is a small celestial body composed of rock and ____. When comets get close to the Sun, the Sun’s heat causes some ice to _______ forming a ____ and tail. • Sometimes called “dirty snowballs”. • They follow a highly _____ orbit around the Sun.
WHERE DO COMETS ORIGINATE FROM? • Most comets originate from one of two places: • ______ Belt – region of the solar system just past Neptune that contains comets and asteroids. • ______ Cloud – huge spherical cloud filled with billions of icy bodies at the outer reaches of the solar system https: //www. youtube. com/watch? v=f. GTq 14 q. Cw. Jk
WHAT IS A METEOROID? • A meteoroid is a small rocky body that orbits the Sun. It is much _____ than an asteroid, only dust and rock up to 10 meters. • Many meteoroids are formed when asteroids ______, shooting out smaller debris. • Other meteoroids are ______ comets leave behind.
DIFFERENCE BETWEEN METEOROID, METEOR, AND METEORITE • Meteoroid is small rocky material out in _____. • When meteoroids pass into Earth’s _____, they become meteors. • If meteors can make it through Earth’s atmosphere and strike the ground, they become _____.
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