F10-15常州成丰玻璃转子流量计.ppt

Our Solar System Fifth Grade Presentation By, Andrea Gioulis Our Solar System The sun is a star with nine planets orbiting around it. This family of planets is called the solar system. The planets all travel around the sun in the same direction, and are held in orbit by the gravitational pull of the sun. The orbits of the planets are slightly elliptical in shape. The nine known planets, in order of distance from the sun, are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Neptune, and Pluto. The Sun The sun is a star which is the center of our solar system. The sun is composed of gases. It has a diameter of 1,400,00 km. Temperatures on the sun can reach as high as 15,000,000 ° Kelvin. Mercury Mercury is the smallest planet. It is the closest planet to the sun, and this accounts for its extremely high surface temperatures. There is no air or water on Mercury. Venus Next to the sun and moon, Venus is the brightest object in the sky. Venus has very heavy cloud cover and strong surface winds. Earth Three fourths of the Earth’s surface is covered with water. The entire pleat is surrounded by an immense body of air called the atmosphere. Earth has one natural satellite, the moon. Mars Mars shines with a reddish glow. The reddish color of the soil is due to the rusting of iron rich minerals as they react with the soil and water. The Polar Caps of Mars are 1-3 km thick and are more extensive during the Martian winter. Mars has two natural satellites, Phobos and Deimos. Jupiter Jupiter is the largest planet in the solar system. The surface of Jupiter has light and dark bands of gaseous clouds covering its liquid hydrogen core. A striking feature of this planet is the Great Red Spot, which changes periodically in color and brightness. Saturn Saturn is the second largest planet in our solar system. It is known to have at least 21 moons. Saturn is a unique planet because it has many rings. Uranus Uranus is the third largest planet. Its atmosphere is composed of methane, givin