Space and astronomy news
This view of Earth’s horizon was taken by an Expedition 7 crewmember onboard the International Space Station, using a wide-angle lens while the Station was over the Pacific Ocean. A new study suggests that Earth's water didn't all come from comets, but likely also came from water-rich planetesimals. Credit: NASA
The study was conducted by David C. Catling and Joshua Krissansen-Totton of the Department of Earth & Space Sciences and the, the team considered how long-lived extraterrestrial civilizations may deplete their supplies of deuterium – something that would be detectable by space telescopes. In recent years, it has been suggested that excess carbon dioxide and radioactive isotopes in an exoplanet’s atmosphere could be used to infer the presence of an industrial civilization. In the same vein, low values of D/H in an exoplanet’s atmosphere could be used to detect a highly advanced and long-lived civilization. As Catling explained in a recent interview with phys.org, this possibility is one he began pondering years ago.
A model JWST transmission spectrum for an Earth-like planet, showing the wavelengths of sunlight that molecules like ozone , water , carbon dioxide , and methane absorb. Credit: NASA, ESA, Leah Hustak
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