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Asteroids, Meteors and Comets/ Gravitational Pull
Fabian Bowmanon 10 September 2013
Transcript of Asteroids, Meteors and Comets/ Gravitational Pull
A comet is composed of dust and rock particles mixed with frozen water, methane, and ammonia that orbit the Sun.
Can sometimes be referred to as a dirty snowball .
The Oort Cloud is a cloud of comets that is located beyond the orbit of Pluto. It suggests that the gravities of the Sun and nearby stars control the paths of the comets.
Commonly Known comets: Halley's Comet, Comet Hale-Bopp
Parts of a Comet
As a comet approaches the Sun it changes. The ice vaporizes from the heat of the Sun and releases dust and jets of gas which form a bright cloud called a coma around the nucleus. The solar wind pushes the gases and dust away from the Comet causing it to form a tail.
Meteoroids, Meteors, and Meteorites
The pieces of dusts and rock that derive from comets along with rock from other places in space are called METEOROIDS.
When a Meteoroid fall into Earth's gravitational pull and enter our atmosphere they are called a METEOR. We call them shooting stars.
When a meteor does not burn up completely in Earth's atmosphere and it lands on Earth is is called a METEORITE.
An asteroid is a piece of rock similar to the material that formed into planets.
Most asteroids are located in an area located between the orbits of Mars and Jupiter called the asteroid belt
Scientists monitor the positions of the asteroids, however it is unlikely that an asteroid will hit Earth in the future.
Gravity is a force that attracts objects to one another. It is a pulling force.
The strength of the pull of gravity depends on two factors. The product of the masses and distance from other objects.
Planets follow in orbits called an ellipse which is shaped like an oval.
The tendency of an object to keep doing what its been doing is the inertia which tends to lead planets to follow a straight path.
But because of the gravity of the sun that pulls inward and the speed and direction of a planet that moves outward. Planets revolve in a curved path.
Asteroids, Meteors, Comets