NASA's Perseverance rover on Mars has collected its 24th sample of Jezero Crater. The 'Comet Geyser' sample is "great for biosignature studies," according to the space agency's Jet Propulsion ...

NASA's Perseverance rover has been busy gathering bits of Mars — rock cores the size of chalk sticks, clusters of broken fragments no bigger than pencil erasers, and even grains of dust fine enough to ...