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Because we live on Earth, Canada Goose Outlet and we see objects passing across our view of the skies, it natural to assume that the Earth is the center of the Universe. In fact, this perspective known as geocentrism was the default for all ancient civilizations. The Sun, the Moon, the planets and the stars appeared to move around the Earth each day. And because the Earth itself didn seem to be moving, astronomers like Ptolemy assumed that Earth canada goose coats on sale was the center of canada goose clearance sale the Universe. In fact, they went so far as to create very detailed models for predicting the motions of objects with a high degree of cheap Canada Goose accuracy, using this completely inaccurate model of the Solar System. The predictions made by Ptolemy were used to make astrological canada goose coats predictions for more than 1500 years, until a much better model came along.

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canada goose clearance A new, more accurate model of the Solar System didn come around until the 16th century, when the Polish astronomer Nicolai Copernicus published his Universe changing book: On the Revolutions of the Heavenly Bodies. Copernicus accurately reorganized canada goose deals the Solar System, putting the Sun at the center in a heliocentric model. And the Earth took its proper place, as just another planet orbiting the Sun one of the 6 known to astronomers at the time. canada goose clearance

Canada Goose Outlet Copernicus model helped answer two questions which had troubled astronomers for centuries: why the planets brighten and dim over the course of several months (because they getting closer and further away), and why the planets seem to reverse and move in a retrograde direction. Easily explained because of the changing positions of the Earth, planets and the background stars. Canada Goose Outlet

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Canada Goose online Once they could accurately describe the nature of the planetary motion in the Solar System, they were left with a more fundimental question: Why do the planets orbit the Sun? What sequence of events led to the current motions of the planets around the Sun? Canada Goose online

canada goose uk outlet Canada Goose online To explain this, we need to look back 4.6 billion years ago, before there was even a Solar System. In our place instead, there was a massive cloud of hydrogen gas left over from the Big canada goose black friday sale Bang. Some event, like a nearby supernova explosion Canada Goose sale triggered a gravitational canadian goose jacket collapse of the cloud, causing the hydrogen atoms to attach to one another through mutual gravity. canada goose uk outlet

uk canada goose Each individual hydrogen canada goose outlet atom had its own momentum, and so when the atoms collected together into larger and larger clumps of gas, the conservation of momentum across all the particles set these clumps of gas spinning. Imagine two spinning skydivers colliding with one another in mid air; after their collision, they have a new rotation speed and direction based on the addition of their original directions. uk canada goose

canada goose store Eventually all of this hydrogen gas was collected together canada goose clearance into a massive spinning ball of gas that continued to canada goose collapse under its own gravity. As it collapsed, it began to spin faster and faster, just like a figure skater pulling in her arms increases her rotation speed. canada goose store

buy canada goose jacket cheap The spinning cloud of gas and dust flattened out because of the rotational force, with the Sun at the center, and then a pancake shaped disc of material surrounding it. The planets formed out of this disk of material, collecting together particles of dust into larger and larger rocks until planet sized objects had accumulated together. buy canada goose jacket cheap

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canada goose clearance sale The planets orbit the buy canada goose jacket cheap Sun because they left over from the formation of the Solar System. Their current motion depends on the gravitational attraction of the Sun at the center of the Solar System. In fact, they in perfect balance. canada goose clearance sale

canada goose factory sale There are two opposing forces acting on the planets: gravity pulling buy canada goose jacket them inward, and the inertia of their orbit driving them outwards. If gravity was dominant, the planets would spiral inward. If their inertia was dominant, the planets would spiral outward into deep space canada goose factory sale.