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COMMONWEALTH Games 2010 Resource Available NOW!
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The SOLAR SYSTEM is made up of the Sun and all the objects that orbit (revolve around) it. The main orbiting bodies are the nine known planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Six of these planets have orbiting objects of their own, called moons. There are 91 known moons in the solar system, and there are probably many more to be discovered.
In addition to the planets and their moons, there are many other objects orbiting the Sun, including asteroids, meteoroids, comets, and gigantic clouds of dust and gas.
The Solar System is enormous. Pluto, the outermost planet, is sometimes as much as 4.5 billion miles (7.3 billion Km) from the Sun, but the Solar System extends much farther than that. Scientists believe that most distant edges of the Solar System may be 17.6 billion Km from the Sun.
A planet rotates around an imaginary line running through the middle of the planet, from top to bottom, called an axis. Each planet’s axis is tilted at a different angle. The nine planets and their moons orbit the sun, all in the same direction. Seven of the planets orbit on roughly the same plane, which means that their paths can all be traced on the same flat surface. Mercury and Pluto are different from the rest of the planets. Their orbits are tilted away from the plane the others occupy.
As planets orbit the sun, they rotate, or spin around and around. This rotation causes day and night. When your side of Earth is facing the sun, it’s daytime where you live. When your side is facing away from the sun, day turns to night. One full spin, or rotation, is called a day. The length of a day changes from planet to planet. A day on Jupiter is less than 10 Earth hours long, while Venus’s day is more than 117 Earth days long!
This resource is available as a printed Pack or on CD-ROM. The cost is $35 (Incl P&P) per Pack or CD, or $55 for Pack and CD-ROM.
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Posted by Chris on Friday, April 29 @ 06:33:19 EDT (20742 reads)
(Read More... | Score: 4.2)
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