A Cautionary Tale

(Slate::Bad Astronomy) – Phil Plait:

Take a moment and indulge me. I want you to imagine a scenario.

Astronomers mapping the sky find a moving object, incredibly faint, in their data. It’s moving slowly, so it’s very far away and probably small. Their best guess is that it’s an asteroid about a kilometer across.

Because it’s faint and relatively far away, they can only get a very rough estimate of its orbit. It appears to be on a trajectory that brings it into the inner solar system …

bad_astronomy/2015/06/10/cautionary_tale

Earth in crosshairs

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