The solar system has eight planets. The planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. The planets are all round, like balls. The planets all go around the sun. Mercury is the closest to the sun. It is very hot on Mercury. The planets far away from the sun are very cold. Venus is between Mercury and the earth. It is sometimes called Earth's " sister planet "because they have almost the same size and shape. The earth is where we live. From space, the earth looks blue because it has so much water. Jupiter is the largest planet in our solar system. Saturn is known for having rings around it. Uranus was the first planet discovered with a telescope. We can see Venus, Mars, Jupiter, and Saturn with our eyes; however, to see Uranus, we need a telescope. Neptune is the 8th planet in our solar system. The planet is the farthest from the sun.
Probes(探测器) go into space and take pictures of the planets. We learn a lot from these pictures. If you could send a probe to any planet, where would you send it?
