* Astronomy

Astronomers solve mystery of dusty foot trails crossing telescope mirrors
Accustomed to peering through the dust and debris of outer space, astronomers at the Smithsonians Whipple Observatory in southern Arizona were perplexed to find fresh deposits of dust and dirt upon the fragile mirrors of their telescopes. What type of creature is small, four-legged, and likes to leave its footprints on scientific instruments, they wondered?

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