Asian giant hornets spotted for first time in US

A deadly giant insect known as the "murder hornet" has been spotted for the first time in the United States, prompting fears it could decimate the honeybee population and creating a buzz on social media.

Video: The latest look at 'first light' from Chandra

NASA's Chandra X-ray Observatory has captured many spectacular images of cosmic phenomena over its two decades of operations, but perhaps its most iconic is the supernova remnant Cassiopeia A.

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