Comets

In Glogpedia

by edgar122
Last updated 6 years ago

Discipline:
Science
Subject:
Astronomy

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Comets

Early in the life of the solar system, dust and rock circling the sun were pulled together by gravity into planets. But Jupiter, the largest planet, kept a number of the pieces from coalescing into another planet. Instead, its gravity disrupted the formation process, leaving an array of unattached asteroids. Many asteroids in the main asteroid belt are driven toward Mars-crossing orbits which slowly increase the orbital ellipticity of the asteroids.Asteroids sharing an orbit with a planet, are known as Trojan asteroids. Although Trojan asteroids have been discovered for Mars and Neptune and even Earth , the term ‘Trojan asteroid’ generally refers to the asteroids accompanying Jupiter.

Comets

A meteor shower is a celestial event in which a number of meteors are observed to radiate from one point in the night sky. These meteors are caused by streams of cosmic debris called meteoroids entering Earth’s atmosphere at extremely high speeds on parallel trajectories.

The current theory on the composition of comets came from Fred Whipple in 1950. It is called the dirty snowball theory. At the center of the comet's head is the nucleus, typically several kilometers in diameter. This nucleus is composed of ices of water, ammonia, carbon dioxide and methane with dust mixed in. The dust particles are smaller than the particles in cigarette smoke. Surrounding the nucleus is the coma which may be over a million km across. The coma is quite bright, both because of reflected sunlight and because some of the freed gasses become ionized and radiate. Many comets have two tails, a gas tail and a dust tail and they may extend 150 million km. Both always point away from the Sun. The dust tail is caused by dust particles released from the gasses being vaporized. The dust tail usually curves slightly behind the comet. The gas, or ion tail is composed of ionized gasses excited by the ultraviolet radiation from the Sun. The gas tail is brighter than the dust tail.

Source of Comets

Many of the comets come from eaither Kuiper Belt or Oort Cloud.

Comets and Solar System Debris

Asteroids

MeteoroidsMeteoroids

Asteroids are rocky fragments left over from the formation of the solar system about 4.6 billion years ago. Most asteroids orbit the sun in a belt between Mars and Jupiter. Scientists think there are probably millions of asteroids, ranging widely in size from hundreds of kilometers across to less than one kilometer (a little more than one-half mile) wide.

Asteroids fragments


Comments

  • winkyjam 5 years ago

    winkyjam's avatar

    I like how you arranged it