Astronomers, planetary scientists and spacecraft operators are working together to take maximum advantage of a once-in-a-lifetime opportunity to observe an Oort Cloud comet as it hurtles past Mars on Oct. 19. The result could be new knowledge about the formation of the Solar System, and perhaps the first images of a comet collected from the surface of another planet. But the high-speed pass of the Comet Siding Spring will also threaten the fleet of orbiters circling Mars as it passes within ...


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