~ Earth is a small, rocky planet which supports a variety of life! As far as we know, Earth is unique from all other planets in this respect.
   
~ Temperatures at the Earth's center (called the "core") may be as high as 7500 K - That's hotter than the surface of the Sun!
   
~ The Earth is the densest major body in the solar system. This means that it's the most "compact" of all the planets. For example, you have two loaves of bread, both of the same amount. You smash one loaf of bread flat. Even though both loaves are of the same amount, the smashed bread is *denser* because it is more compact.
   
~ The Earth is 4.5 to 4.6 billion years old, but the oldest known rocks are less than 4 billion years old. Rocks older than 3 billion years are rare. The oldest fossils of living organisms are less than 3.9 billion years old!
   
~ The Earth is orbited by one moon.