Mercury and Venus
Mercury is the first planet form the sun. It's size is about the same as Earth's moon, but just a little bit bigger. It's the smallest planet in our solar system. This planet has no atmosphere and there are a lot of craters (holes) on it. Since this planet is the closest to the sun, the side that gets shined on is super hot. Surprisingly, on the other side of Mercury that isn't radiated by the sun is super cold. Sometimes it goes about hundreds of degrees below freezing temperature. It takes Mercury 88 days to complete an orbit around the sun. One day on Mercury takes 59 Earth days which means that it takes 59 Earth days for the side of Mercury that was getting radiated by the sun to spin into the freezing side (the side that doesn't get shined). This planet has no moons. It's about 58 million km. from the sun and it has no known living organisms inhabiting on it.
Venus is a hot volcanic planet. It's the second planet form the sun. It has a thick atmosphere which traps the sun's radiation making it the hottest planet in our solar system. It's atmosphere can go up to about 465 degrees Celsius. This planet has about the same size as Earth. One day on Venus is 243 Earth days and it takes this planet 224 Earth days to complete an orbit around the sun. Both Venus and Earth have a core and a mantle. Venus' orbit is different from any of the other planets. It spins in a different direction. Astronomers think that the cause for this is because of an asteroid that crashed into Venus and thus reversing the spinning direction. The robots/machines that was sent to explore Venus exploded about a few hours after it landed on the scorching planet. Scientists discovered that there is life in Venus.... Just kidding... There hasn't been any organisms that is able to live on that volcano filled planet.
