When to See Comet PanSTARRs

Today would be a great day.

"Look too early and the sky will be too bright," said Rachel Stevenson, a NASA Postdoctoral Fellow at the agency's Jet Propulsion Laboratory in Pasadena, Calif. "Look too late, the comet will be too low and obstructed by the horizon. This comet has a relatively small window."

A good time to look is about 40 minutes after sunset. The comet may appear as a sort of exclamation point in the evening sky, with the point being the comet itself and its diffuse tail stretching nearly straight up from the horizon, JPL officials added.

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