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Transcript
Recent Impact Sites on the Moon On average, 300 tons of mass (the mass of the obelisk shown above) is added to the Earth from meteorites each day. Different Types of Meteorites Stony Meteorites Iron Meteorites Stony-Iron Meteorites are the Most Exotic of All Space Debris Found on Earth 1 In 1969, the Allend meteorite created a dazzling blue display in the skies near Chihuahua, Mexico, before impact. SLICED OPEN The dark blue color is due to carbon in the meteorite. Trees flattened over an area 30km in diameter by the Tunguska Impact in 1908 Confirming an ExtinctionLevel Impact Site 2 WHAT DID YOU THINK? ! Are the asteroids a planet that was somehow destroyed? ! No. Jupiter’s gravitational pull prevented planets from forming in the asteroid belt, and the total mass of the asteroids is much less than even that of Pluto. ! How far apart are the asteroids on average? ! Why do comets have tails? ! ! 10 million kilometers Gas and dust evaporate from a comet’s nucleus, and these tails are pushed away from the Sun by sunlight and solar wind. ! In which direction does a comet’s tail point? ! What is a shooting star? ! ! Directly away from the Sun. A piece of space debris plunging through the Earth’s atmosphere. Key Terms Apollo asteroid asteroid (minor planet) asteroid belt coma (of a comet) comet dust tail (of a comet) gas (ion) tail hydrogen envelope impact crater Kirkwood gaps Kuiper belt long-period comet meteor meteor shower meteoroid nucleus (of a comet) Oort cloud radiation (photon) pressure short-period comet stable Lagrange points tail (of a comet) Trojan asteroid 3