Icy Exocomets Around a Distant Star Help Explain Earth’s Water

This illustration shows the PDS 70 system, including its two exoplanets. Comets are shown approaching the star, releasing volatiles that sublimate as the comets warm. Image Credit: Aline Novais

Did icy comets deliver water to the young Earth? That idea won’t go away. Now, astronomers at Lund University in Sweden have found evidence of exocomets orbiting a young star named PDS 70. The observations suggest that these comets are delivering water to that system’s inner regions.

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