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Date : 2010-08-15
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Overview Comets – NASA Solar System Exploration ~ Comets are cosmic snowballs of frozen gases rock and dust that orbit the Sun When frozen they are the size of a small town When a comets orbit brings it close to the Sun it heats up and spews dust and gases into a giant glowing head larger than most planets The dust and gases form a tail that stretches away from the Sun for millions of miles
Comets and Asteroids Space Rocks Our Solar System Greg ~ Comets and Asteroids Space Rocks Our Solar System Greg Roza on FREE shipping on qualifying offers Presents general information about comets and asteroids including what they are what they are made of
Overview Asteroids Comets Meteors – NASA Solar System ~ Asteroids and comets—and the meteors that sometimes come from them—are leftovers from the formation of our solar system 46 billion years ago While the planets and moons have changed over the millennia many of these small chunks of ice rock and metal have not They are a lot like a fossil record of planetary evolution
Asteroids and Comets Information and Facts National ~ Asteroids and comets are considered remnants from the giant cloud of gas and dust that condensed to create the sun planets and moons some 45 billion years ago Today most asteroids orbit
Overview Asteroids – NASA Solar System Exploration ~ Asteroids Comets Meteors Overview Asteroids sometimes called minor planets are rocky airless remnants left over from the early formation of our solar system about 46 billion years ago
Space Rocks – Comets Asteroids Meteorites and More ~ Asteroids that pass close to Earth are called NearEarth Objects NEOs Comets Large objects made up of rock dust and ice tens of kilometres in size that originate from the Oort cloud at the extremes of the solar system they are remnants of its creation billions of years ago
Kids Cosmos Explore Asteroids Meteors and Comets ~ Comets throughout history have been thought to bring bad luck but these are just natural phenomena of the solar system The nucleus of a comet is like a ball of rock and dirty snow As these objects get close to the sun the frozen gases and dust begin to heat and cause a long tail of vaporized gases dust and debris to flow behind them
NASA Space Rocks ~ NASA and other scientists study space rocks to help us learn about the origin of our solar system Asteroids are thought to be the leftovers from the formation of the inner solar system including Earth Comets are thought to be leftovers from the formation of the outer planets
Our Solar System NASA Solar System Exploration ~ Our solar system is made up of a star—the Sun—eight planets 146 moons a bunch of comets asteroids and space rocks ice and several dwarf planets such as Pluto The eight planets are Mercury Venus Earth Mars Jupiter Saturn Uranus and Neptune Mercury is closest to the Sun
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