Astronomy and paleontology have many things in common. In childhood, anyone is interested in the stars in the sky and can memorize the names of numerous dinosaurs. Dinosaurs 100 million years ago are buried Gobi Desert in Mongolia, which is good for stargazing because there is little rain or clouds. It is also common that amateur researchers, not professional researchers, can contribute to research field. Just as amateur astronomers discover new comet-like objects, amateur fossil hunters and even curious travelers can find dinosaurs. Most powerful hypotheses about the extinction of dinosaurs is a collaboration between astronomy and paleontology. Unlike astronomical studies about cosmic ‘space’, how are fossils that are the research subject of cosmic and earth ‘time’ studies made, how are they discovered, and how are they studied?