An Easter egg hunt in south-western Germany took a worrying turn on Sunday when two men discovered a vial labelled "Polonium 210" in a garden, triggering an emergency response as authorities tested for the potentially lethal radioactive substance. District fire chief Andy Dorroch said initial on-site measurements were carried out to detect radioactivity, but all of them came back negative.

Multiple NASA missions captured images as an interstellar comet zoomed by Mars in October.

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