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why do planets move around the sun

George Spagna, chair of the physics department at Randolph-Macon College, explains. Stars and planets form in the collapse of huge clouds of interstellar gas and dust. The material in these clouds is in constant motion, and the clouds themselves are in motion, orbiting in the aggregate gravity of the galaxy. As a result of this movement, the cloud will most likely have some slight rotation as seen from a point near its center. This rotation can be described as angular momentum, a conserved measure of its motion that cannot change. Conservation of angular momentum explains why an ice skater spins more rapidly as she pulls her arms in. As her arms come closer to her axis of rotation, her speed increases and her angular momentum remains the same. Similarly, her rotation slows when she extends her arms at the conclusion of the spin. As an interstellar cloud collapses, it fragments into smaller pieces, each collapsing independently and each carrying part of the original angular momentum.


The rotating clouds flatten into protostellar disks, out of which individual stars and their planets form. By a mechanism not fully understood, but believed to be associated with the strong magnetic fields associated with a young star, most of the angular momentum is transferred into the remnant accretion disk. Planets form from material in this disk, through accretion of smaller particles. In our solar system, the giant gas planets (Jupiter, Saturn, Uranus, and Neptune) spin more rapidly on their axes than the inner planets do and possess most of the system's angular momentum. The sun itself rotates slowly, only once a month. The planets all revolve around the sun in the same direction and in virtually the same plane. In addition, they all rotate in the same general direction, with the exceptions of Venus and Uranus.


These differences are believed to stem from collisions that occurred late in the planets' formation. (A similar collision is believed to have led to the formation of our moon. )
Why do planets move??? Planets move clockwise around the sun,Pbecause the gas that originally formed the Solar System was spinning, but the gas that wasn t spinning fell into something called the Proto-Sun. Our planets formed from these gases and matterPthat were spinning enough to fall into orbit. Once the planets were in orbit, there was no reason as to why they could stay there, therefore they orbited around the sun. The Solar System is so vast, that the expansion of the Universe has very little and minimal affect. Each planet also has an axis. All of our planetsProtate around these axis and also revolves around the sun.


What keeps the planets in orbit??? PThe sun s gravity and energy is what keeps the planets in orbit. All of the planets travel fast enough around the sun, but not to fast, therefore it keeps the planets in a continuous orbit. Who first discovered how the planets move??? Johannes Kepler was the first to explain just how the planet s orbitParound the sun. He discovered that planets move in an elliptical, not circular, orbits. He came up with three laws of Planetary Motion. The first law says that the planets orbits are ellipses, with the sun a stationary point of focus. The second law says a line connecting the planet to the sun, will sweep over equal areas in equal amounts of time. This still applies even when the Earth is in its elliptical orbit. The third law is an equation which explains the distance between a planet from the sun and the lenght of its revolutionary period

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