What is a planet? <ul><li>A planet is a large object which moves around a star. </li></ul><ul><li>Eight planets have been discovered in our solar system: </li></ul><ul><li>- Mercury, Venus, Earth, and Mars are the planets closest to the Sun. They are called the inner planets. The inner planets are made up mostly of rock. </li></ul><ul><li>- The outer planets are Jupiter, Saturn, Uranus, and Neptune. They are large balls of gases with rings around them. </li></ul><ul><li>All eight planets travel around the Sun in a different orbit. </li></ul>
Mercury <ul><li>Mercury is only about one-third the size of the Earth. It is smaller than any other planet. </li></ul><ul><li>Mercury is very close to the Sun and has no substantial atmosphere. </li></ul><ul><li>These factors contribute to the fact that the surface of Mercury has the greatest temperature range of any planet or natural satellite in our solar system. </li></ul><ul><li>Mercury does not have any naturally occurring satellites. </li></ul>
Venus <ul><li>Venus and Earth are almost the same size. </li></ul><ul><li>Venus is the closest planet to Earth, but it does not have oceans or human life like Earth. </li></ul><ul><li>Venus has several large inactive volcanoes. Much of the surface is covered by old lava flows from these volcanoes. </li></ul><ul><li>Venus is unusual because it rotates in a direction opposite that of all of the other planets. </li></ul><ul><li>Venus spins very slowly as it orbits the Sun. </li></ul>
Earth <ul><li>Earth is the third closest planet to the Sun. </li></ul><ul><li>It has an atmosphere made up of many different gases.The atmosphere gives us air to breathe. </li></ul><ul><li>It takes one year to go around the Sun one complete time. The Earth also rotates, or spins, on its axis. It takes one day to spin around one complete time. </li></ul><ul><li>The Earth's axis is not straight up and down, but tilted a little bit. This tilt is responsible for us having seasons. Otherwise, the temperature would be pretty much the same all year long. </li></ul>
Mars <ul><li>The temperature on Mars can be very, very cold. On its warmest day, Mars can still be a very cold place. At the top and bottom of the planet are poles just like on Earth. During the Martian winter, ice caps can be seen at the poles. </li></ul><ul><li>Space probes have landed on Mars. </li></ul><ul><li>Mars has many craters which were formed by meteorites or asteroids hitting it. </li></ul>
Jupiter <ul><li>Jupiter is the largest of the plants with a volume 1400 times greater than that of the earth. Jupiter is made almost entirely of gases. Jupiter is covered by </li></ul><ul><li>A layer of clouds that is many miles deep. It is the 5th planet from the sun. Jupiter is 88,729 million miles from the sun. </li></ul>
Saturn <ul><li>Saturn is unusual because of its rings. There are thousands of rings. They are mostly ice mixed with ashes and dust. Saturn is the 6th planet from the sun. Saturn is 888 million miles from the sun. Saturn has more than 17 moons. Saturn would float in a tub of water. </li></ul>
Uranus <ul><li>Uranus is 7th planet from the Sun. It is 1.8 billion miles from the sun. They got the name for Uranus because of the famous Greek god. It has 15 moons. The top of Uranus is frozen gas. Those are some facts about Uranus. </li></ul>
Neptun <ul><li>Neptune is the 8th planet in the Solar System. Neptune’s distance from the sun is 2.8 billion miles. Neptune has 8 moons. Neptune is a large planet with rings. Later the planet was named Neptune after the Roman god of the sea. You need a telescope to see Neptune. </li></ul>
A particular slide catching your eye?
Clipping is a handy way to collect important slides you want to go back to later.