When dinosaurs walked the Earth, days on our planet were a little bit shorter than the full 24 hours we know today.
원문출처 : https://www.cnn.com/2020/03/13/world/early-earth-shorter-day-scn/index.html
원문출처 : https://www.cnn.com/2020/03/13/world/early-earth-shorter-day-scn/index.html