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The surprisingly clear image, which was captured over the city of Xiamen, has been circulating social media in recent days.

The U.S. military is looking into ways of intercepting and retrieving adversarial stratospheric surveillance balloons for further study.

This week, find out how a new "pangenome" better captures the richness of human diversity, how NASA studies sleep issues for astronauts, how the Voyager space probes are kept operating, how privatized spaceflight is heating up, and more.