Human and Universal

When I saw this picture, I was feeling amazing. Image that thousand year ago, human still didn't understand what the world is. Most of the people in this time believed that the sky and the grand are connect together and the earth, moon and sun are the only plants in this universal. Since human made the rocket, more and more plants was found. Compare to the universal, I was feeling that how small I'm, I was like a one of the sand in the desert. The universal is so huge that we can even image. I believed that human is not the only creature in this huge universal, maybe long time later, we will be able to live in the out space and meet the other creature in this universal