Dinosaurs like Stegosaurus, Iguanodons and Giganotosaurus lived in the early Cretaceous Period, while Earth was on the other side of the galaxy. Tyrannosaurus rex existed when Earth was in a part of the galaxy that is closer to our current position.
For the past decade, Christiansen has studied planet occurrence rates, or how often and what kinds of planets occur in the galaxy, while studying data from exoplanet hunters such as NASA's Kepler, K2 and TESS missions.During a stargazing party at the California Institute of Technology, Christiansen was explaining how young the stars were that they observed. The skywatchers were looking at the Pleiades, a bright young cluster of stars that are some of the youngest in our sky.
— Dr. Jessie Christiansen November 7, 2019 She wanted to share the idea that even though astronomical timescales seem vastly different from our own, they actually match up quite well with archaeological timescales.
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