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.
She told her fellow stargazers that before they went extinct, dinosaurs wouldn't have even seen these stars in the sky because they didn't exist until millions of years after the extinction event. And she told them that when dinosaurs such as stegosaurs roamed the Earth, our entire solar neighborhood was on the opposite of the Milky Way galaxy that it is now.
She had been wanting to create an animation of this intriguing idea for a while and the reaction of the stargazers inspired her one night after her children went to bed. Using the classic Milky Way illustration, as if it were viewed from above, by Caltech senior scientist Robert Hurt, Christiansen built the animation using timed slides in PowerPoint. Then she recorded the screen to create a video she could share on Twitter.
Based on our current position in the galaxy and the timescales shared in the animation, we've essentially completed an orbit of it. The extinction event 65 million years ago was followed by the rise of mammals and we're still in that"phase," so to speak. At the end of the animation, Christiansen proposes an intriguing question: What will be on the planet the next time we complete another orbit?
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