Darryl Z. Seligman completed his undergraduate degrees in Mathematics and Physics at the University of Pennsylvania in 2015. He completed his Ph.D. at Yale University in Astronomy in 2020, and was awarded the Yale University Dirk Brouwer Memorial Prize for Outstanding Ph.D. Thesis.
Space enthusiasts will know — it's easy to get caught up in a wealth of fascinating developments, from missions to the lunar surface to new discoveries in exoplanet science. But as an astronomer, what has me really excited right now is a largely overlooked development here on Earth that could have profound implications for how we understand the development of life on our planet and one of its most unique features: our oceans.
Comets are small bodies, like asteroids, that also contain ices such as water and carbon dioxide. When a comet heats up as it gets close to the sun, this ice becomes a gas and gets blown off the surface, producing a rocket-like acceleration and a tail of gas and dust. If dark comets do contain water, they could be the missing link in our understanding of where our oceans came from. It is possible that they, or dark comets like them in the past, had water that resembles our oceans.that came from another star system — our first interstellar object. Like the dark comets, 'Oumuamua disguised itself as an asteroid because it had no obvious cometary tail, but it accelerated like a comet.
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