Did 40-year-old Viking experiment discover life on Mars?

(Phys.org)—In 1976, two Viking landers became the first US spacecraft from Earth to touch down on Mars. They took the first high-resolution images of the planet, surveyed the planet's geographical features, and analyzed ...

Rosetta data reveals process behind color-changing chameleon comet

A grand synthesis of Rosetta data has shown how its target comet repeatedly changed color during the two years it was watched by the spacecraft. The chameleon comet's nucleus became progressively less red as it made its close ...

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