19-4 Earth’s Moon.

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19-4 Earth’s Moon.
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19-4 Earth’s Moon

Earth’s moon No ________________ Temperatures range from 100 degrees celsius to -170 degrees celsius. Gravity is ______ that of Earth. Contains ________ the mass of Earth, but the density is the same throughout No internal heat

Formation of the moon Several theories __________________ where Mars sized object skimmed off young Earth, materials from outer layers were thrown into space and combined with an asteroid to form the moon.

Features of the moon Galileo an Italian astronomer invented the telescope. He saw three types of features. ___________ – vary in size, circular, caused by meteoroid impacts, there is no erosion on the moon. ____________ – mountains that cast long shadows __________ – thought to be seas, but really ancient lava flows – flat dark areas

Missions to the moon 1961 NASA was launched 1964-1972 Space race, Soviets and USA Surveyor (US) was the first to land Surface of the moon is solid, but covered in a layer of fine __________. Footprints remain ___________. No weathering and erosion.

Moon landings July 1969, US landed Apollo 11, Neil Armstrong & Buzz Aldrin were in a tiny lunar lander named Eagle. “That’s one small step for man, one giant leap for mankind”.

Moon rocks Everything we know about the moon was found out from the moon rocks brought back from the moon landings. Almost all of the moon rocks were formed by cooling of ___________material. (volcano) The surface of the moon was once very _________. Also evidence of meteor bombardment.

Instruments left on the moon Instruments left on the moon show that the interior has ____________. There is no seismic (earthquakes) activity except from meteors. The entire surface of the moon has been photographed. There is evidence of frozen water at the poles. The far side of the moon (the one we don’t see) is much ____________ than the side we see.