BALTIMORE (WJZ) — A comet looping behind the sun could emerge this fall as a once-in-a-lifetime spectacle, or it may not. Mike Schuh has more on what he calls the “intergalactic snowball.”

Educators have a different take.

“It’s called Comet ISON,” said Jim O’Leary of the Maryland Science Center.

NASA provided an image of ISON (agove). It has a small head and a big tail.

“That tail can get tens of millions of miles long, so it’s huge,” O’Leary said.

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