I went the Museum of naturul history on last week. I'll show three histories. First, I'll show the earth's birth. The earth formed when the

universe born after 4.6billion years ago.next is a object of space. The meteor is a small chip in space, the planat ,fixed star,comets are in space too.Last, troodon is a smart dinosaur. Because troodon brain weight 37~45kg. This is a end. bye~