I went the Museum of Natural History last week. I'll show three histories. First, I'll show the earth's creation. The earth formed when the universe was created 4.6billion years ago. next is a object of space. The meteor is a small chip in space, the planet ,fixed stars, and comets are in space too.Last, troodon is a smart dinosaur. We know this because troodon's brain weight  was 37~45kg. This is the end. bye~