Sure, here are fun facts about each of the planets in our solar system, explained like you're 5:

1. Mercury: Mercury is the closest planet to the Sun, and it's super hot during the day and super cold at night because it doesn't have much of an atmosphere to trap heat.

2. Venus: Venus is sometimes called Earth's "sister planet" because it's similar in size and composition. But it's incredibly hot due to a thick, scorching atmosphere that traps heat.

3. Earth: Earth is the only planet we know of that has life on it! It's covered in oceans, has lots of animals and plants, and it's just the right distance from the Sun for everything to thrive.

4. Mars: Mars is often called the "Red Planet" because it looks reddish in the sky. It has giant volcanoes and a canyon that's longer than the whole United States!

5. Jupiter: Jupiter is the biggest planet in our solar system, and it has a giant storm called the "Great Red Spot" that's been raging for over 300 years.

6. Saturn: Saturn is famous for its beautiful rings, which are made up of chunks of ice and rock. It's like a cosmic hula hoop!

7. Uranus: Uranus is a very unusual planet because it spins on its side, like a rolling ball. It's also the only planet named after a Greek god, not a Roman one.

8. Neptune: Neptune is a really windy planet with the fastest winds in the solar system, reaching up to 1,200 miles per hour! It's also a beautiful shade of deep blue.

9. Pluto (Dwarf Planet): Pluto used to be considered the ninth planet, but it's now known as a "dwarf planet." It's very far away and super cold, and it has a heart-shaped region on its surface.

So, these are some fun facts about the planets, and each one has something special and unique about it in our big cosmic family!