Short note about 8 planets for ppt
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Explanation:
Many of the asteroids in the solar system in orbiting the sun between Mars and Jupiter called the asteroid belt.
Mercury
Mercury is the first of the four terrestrial planets. This means it is a planet made mostly of rock. The planets closest to the Sun—Venus, Earth, and Mars—are the other three.
Mercury is the smallest of the terrestrial planets. It has an iron core that accounts for about 3/4 of its diameter.
Because it is so close to the Sun, it is very difficult to see Mercury. A NASA mission called Messenger is expected to begin orbiting the planet in 2011.
Venus
Of all the planets, Venus is the one most similar to Earth. In fact, Venus is often called Earth's “sister” planet. As similar as it is in some ways, however, it is also very different in others.
Earth and Venus are similar in size. The two planets are very close to each other as they orbit the Sun; because of this, Venus is the most visible planet in the night sky.
Venus
Of all the planets, Venus is the one most similar to Earth. In fact, Venus is often called Earth's “sister” planet. As similar as it is in some ways, however, it is also very different in others.
Earth and Venus are similar in size. The two planets are very close to each other as they orbit the Sun; because of this, Venus is the most visible planet in the night sky.
Mars
No planet has sparked the imaginations of humans as much as Mars. It may be the reddish color of Mars, or the fact that it can often be easily seen in the night sky, that has caused people to wonder about this close neighbor of ours.
Scientists aren't sure. Life as we know it couldn't survive there. Even so, there is evidence that there may be water on Mars.
Jupiter
The planet Jupiter is the first of the gas giant planets. Made mostly of gas, they include Jupiter, Saturn, Uranus, and Neptune.
Jupiter is first among the planets in terms of size and mass. Its diameter is 11 times bigger than Earth, and its mass is 2.5 times greater than all the other planets combined.
Saturn
Most people know about the rings around Saturn, because they are the brightest and most colorful. These rings are made mainly out of ice particles orbiting the planet..
Saturn is the second largest planet. It is the farthest planet from the Earth that can be seen without a telescope.
Uranus
Uranus is the first planet so far away from the Earth that it can only be seen with the use of a telescope. When it was first discovered in 1781, scientists didn't know what they had found. As astronomers studied the object more closely.
Uranus is so far from the Sun that it takes 84 years to complete an orbit of the Sun. It is the only planet that spins on its side, so each pole is tilted away from the Sun for half its orbit.
Neptune
Imagine being so good at math that you could figure out the location of a planet you had never even seen! That is what John C. Adams did in 1843 when he discovered Neptune.
Neptune was named after the Roman god of the sea because it is so far out in the deep “sea” of space
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