Information about eight planets of our solar system
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Fun Facts about Mercury
Mercury can occasionally be seen from Earth
Mercury is the second densest planet in the Solar System
It is mainly made up of iron
There is no atmosphere on Mercury
Despite its fast trip around the Sun, Mercury's revolution is very slow - one day on Mercury equals about 59 days on Earth!
Venus
Venus is the second planet from the Sun. It is named after the Roman goddess of beauty and love. Venus is almost the same size as Earth, but other than size the two planets are very different.
Fun Facts about Venus
Venus appears to be the brightest planet in the sky due to the reflection of the Sun from its clouds, and its closeness to Earth
Venus has an incredibly thick atmosphere. This makes it the hottest of the inner planets
Venus rotates East to West
Venus is covered in volcanoes
Venus does not have any moon.
Earth
Earth is the only known planet that has any life forms in the Solar System. It is the third planet from the Sun. It is the only planet that is not named after a god.
Fun Facts about Earth
Most of the Earth is covered in water - 70%!
Earth has a thin atmosphere, that protects us from dangerous gasses and heat in space
Earth is the largest of the inner planets
Air, water, and land make up the Earth
Earth's axis is tilted at 23.5 degrees
This a video showing the many different life forms that Earth has
Mars
Mars is the fourth planet from the Sun. Named for the Roman god of war, it is also known as the "Red Planet". It is the last of the inner planets.
Fun Facts about Mars
Temperatures on Mars are very similar to temperatures on Earth
It is believed that Mars once had water on its surface
Mars is called the red planet because its surface is covered in red dust
The largest volcano in the Solar System is on Mars. It is called Olympus Mons
Mars has two small moons
Jupiter
Jupiter is the first of the outer planets, and the fifth planet from the Sun. It is named for the king of the Roman gods. It is the largest of all of the planets.
Fun Facts about Jupiter
Jupiter is best known for its "Great Red Spot" - a mass of hurricanes that have been storming for hundreds of years. The spot is larger in size than that of Earth
Jupiter is made up of gasses - there is no solid surface on it
Jupiter is so big; Earth could fit inside of it more than 1,000 times!
Jupiter has over 50 moons. Four of these moons are as big as planets
Jupiter has the most active volcanic activity in the Solar System
Saturn
Saturn is the sixth planet from the Sun. It is named for the Roman god of agriculture. It is most well known for its highly visible rings.
Fun Facts about Saturn
Saturn is the second largest planet in the Solar System
Saturn is the most dense planet, being made up mostly of hydrogen and helium
Due to its lightness and speed, Saturn is not round - it is wider in the middle
Saturn's rings are made up mostly of ice
The second largest moon in the Solar System is one of Saturn's moons
Uranus
Uranus is the seventh planet from the Sun. The only planet named for a Greek god, its name comes from the god of the sky.
Fun Facts about Uranus
Uranus is unique in that its rotation is horizontal
It is believed that the surface of Uranus could be a huge ocean
It takes Uranus 84 years to orbit the Sun
Uranus's rings are perpendicular to it
The clouds on Uranus are amongst the brightest in the Solar System
Neptune
Neptune is the eighth and furthest planet from the Sun. It is named for the Roman god of sea. It is the smallest of the outer planets, and a gas giant.
Fun Facts about Neptune
Neptune is so far from Earth, it is invisible to the naked eye
Much like Jupiter, Neptune has a "Great Dark Spot", containing hurricanes and storms
Winds on Neptune are the strongest winds within the Solar System
There are rings on Neptune, but it is believed that they are relatively new
Neptune has 13 moons
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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