Earth is the third planet from the Sun, and from space it looks like a beautiful blue marble — over 70% of its surface is covered in liquid water oceans, which is why it's the only world we know of where water can exist as liquid, solid, and gas all at once.
A breathable, nitrogen-and-oxygen-rich atmosphere shields us from harmful solar radiation while keeping the planet warm enough for plants, animals, and humans to thrive — a combination no other known world in the universe has.