1. They are all part of our solar system. This seems obvious, but it's a key similarity. All these planets orbit the sun, making them part of the same planetary system.
2. They are all formed from the same basic building blocks. While their composition differs drastically, all planets in our solar system formed from a swirling disk of gas and dust left over from the sun's formation. Earth has a rocky composition, while the outer planets are primarily gas giants.
Let me know if you'd like to explore other similarities or differences!
