Ask Me Anything

I got a new book at the library today, called Ask Me Anything. It's awesome. Here are six things that I've already learned:

1. The universe is 13.7 billion years old.
2. 0.14% of the sun is made out of iron.
3. All the heat in the universe when it started was 18 billion trillion trillion.
4. The universe is expanding 45 miles every second.
5. We're made out of the elements in stars.
6. 1 light year is 5.88 million million miles.