Question

write a paragraph on the solar system.

Answer 1

The Solar System is made up of all the planets that orbit our Sun. In addition to planets, the Solar System also consists of moons, comets, asteroids, minor planets, dust and gas. The inner solar system contains the Sun, Mercury, Venus, Earth and Mars. The main asteroid belt lies between the orbits of Mars and Jupiter. The planets of the outer solar system are Jupiter, Saturn, Uranus and Neptune (Pluto is now classified as a dwarf planet).Everything in the Solar System orbits or revolves around the Sun. The Sun contains around 98% of all the material in the Solar System. The larger an object is, the more gravity it has. Because the Sun is so large, its powerful gravity attracts all the other objects in the Solar System towards it. At the same time, these objects, which are moving very rapidly, try to fly away from the Sun, outward into the emptiness of outer space.The result of the planets trying to fly away, at the same time that the Sun is trying to pull them inward is that they become trapped half-way in between. Balanced between flying towards the Sun and escaping into space, they spend eternity orbiting around their parent star
The Planets orbit in the same direction (counter-clockwise looking down from above the Sun’s North Pole); all but Venus, Uranus and Pluto also rotate in that same sense. Mercury has the fastest elliptical orbit,
48 km per second. It has the shortest revolution at 88 days. Pluto has an orbital speed of 5 km per second. It takes 248 years for Pluto to make one complete revolution.

Answer 2

A planet is any of the large bodies that orbit the Sun, including Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, in order of closeness to the Sun.

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. Most of the rest of the planet is made up of a rocky crust.

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. It is expected that this will help us learn a great deal more about this rarely seen planet.

The Messenger launched on the Boeing Delta II rocket on August 3, 2004. It will reach Mercury on March 18, 2011.

Facts about Mercury

Astronomical Symbol:

Mercury's winged helmet.

Origin of name:

Mercury was a god in Roman mythology. He was a messenger with winged feet.

Diameter:

3,032 miles (4,879 km).

Distance from Sun:

28.5 to 43 million miles (45.9 to 69 million km).

Length of year:

88 days.

Number of Moons:

None.

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. Both planets are relatively young, judging from the lack of craters on their surfaces.

We now know that the environment on Venus couldn't support life as Earth does. Our atmosphere is a breathable mix of oxygen and other gases, but the atmosphere on Venus is mostly carbon dioxide, which is a poisonous gas. The temperature on Earth rarely goes much higher than 100° F (37.8° C), even at the equator, but the temperature on the surface of Venus can exceed 850° F (454° C)!

The atmosphere of Venus would be compared to the exhaust from a car.

The Earth is mostly water, but whatever water that may have existed once on Venus has boiled away due to the intense heat.

Facts about Venus

Astronomical Symbol:

The same as the gender symbol for female.

Origin of name:

Venus was the Roman goddess of love and beauty.

Diameter:

7,520 miles (12,100 km).

Distance from Sun:

About 67 million miles (108 million km).

Length of year:

225 days.

Number of Moons:

None.

Earth

The Earth is the only planet known where life exists. Almost 1.5 million species of animals and plants have been discovered so far, and many more have yet to be found. While other planets may have small amounts of ice or steam, the Earth is 2/3 water. Earth has perfect conditions for a breathable atmosphere.

Earth is the largest of the terrestrial planets and the fifth largest in the solar system. It is believed to be about 4.5 billion years old, which makes it very young compared to other celestial bodies!

A pair of Elks with calf drinking water from the Madison River.

Facts about Earth

Astronomical Symbol:

A circle with an equator and a meridian line at right angles.

Origin of name:

Probably from the Old English word that means “soil.”

Diameter:

7,926 miles (12,755 km).

Distance from Sun:

93 million miles (150 million km).

Length of year:

365 days.

Number of Moons:

One.

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. Tales of “Martians” invading Earth have been around for well over fifty years. But is it likely that any kind of life really does exist on Mars?

Scientists aren't sure. Life as we know it couldn't survive there. Even so, there is evidence that there may be water on Mar

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