Unformatted text preview: Density is less than that of the earth Gravitational pull is one-sixth that of the Gravitational Earth Earth Has no atmosphere nor water Moon is covered with craters The Moon (cont.) The Craters Craters were actually produced by meteoroids meteoroids Pockmarked highland areas make up Pockmarked most of the lunar surface most Consists of maria (dark colored regions) Consists and terrae (light colored regions) and The moon (cont.) The Maria Maria consists of flat plains that resulted from an immense outpouring of fluid basaltic lavas basaltic Terrae consist of highlands which are Terrae elevated several kilometers above the maria maria The terrae and maria make up the “face of The the moon” the The moon (cont.) The Most Most craters are produced by the impact of rapidly moving debris of Craters are so profuse that craters-within Craters craters are the rule craters Largest craters are the “Crater of Largest Copernicus” and the “Crater of Kepler” Copernicus” The moon (cont.) The Earthquakes Earthquakes and volcanic eruptions do not occur on the moon not Micrometeorites continually bombard the Micrometeorites surface of the moon surface Asteroids Asteroids Small bodies that move around space Most asteroids lie between Mars and Most Jupiter Jupiter Some of these asteroids regularly pass Some the Earth the Largest asteroid is Ceres Comets Comets Depicted to be dirty snowballs Composed of ices (water, methane, Composed ammonia, carbon dioxide) ammonia, Most exhibit very long orbits around the Most sun sun Halley’s comet (short period comet) orbits Halley’s completely around the sun once every 76 years years Comets (cont.) Comets Consist of the coma, tail, and the nucleus. Comets (cont.) Comets Short Short period comets: Thought to orbit beyond Neptune in a region called the Kuiper belt Kuiper Long period comets: Formed in the Oort Long Oort cloud cloud Meteoroids Meteoroids Meteoroid: Meteoroid: A small solid particle, which enters the Earth’s atmosphere from interplanetary space interplanetary Meteorite: The remains of meteoroids Meteorite: when found on Earth. when Meteor: The luminous phenomenon Meteor: observed when a meteoroid enters the earth’s atmosphere earth’s Classes of meteorites Classes Irons: Predominantly iron (with nickel) Stony: consists of silicate minerals with Stony: inclusions of other minerals inclusions Stony-irons: Mixture of both the previous Stony-irons: classes classes Stars Stars Most numerous objects in the sky The sun is our closest star The nearest star is Proxima Centauri, The which is 4.3 light years which Measuring distances of stars Measuring Light Light year: The distance that light t...
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- Fall '10
- Solar System, atmosphere atmosphere