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Comet Ison likely didn't survive sun encounter

11/28/2013 09:15 EST | Updated 01/28/2014 05:59 EST

Comet Ison likely didn't survive its graze past the sun early this afternoon, astronomers say.

"It's not looking good for Ison in my opinion," said Phil Plaitt, an astronomer who writes for Slate's Bad Astronomy blog, during a Google Hangout organized by NASA Thursday.

"That's kind of my assessment too," agreed Karl Battams, an astrophysicist at the Naval Research Laboratory in Washington, D.C., who runs the NASA-funded Sungrazing Comets Project.

Images from NASA's SOHO spacecraft at 1:12 p.m. ET showed long tails that appeared as though they could be fading toward the sun, and the head of the comet was no longer visible.

By 2 p.m. ET, images from the Solar Dynamics Observatory spacecraft did not show the comet at all, to the surprise of Dean Pasnell, project scientist for SDO, who said the rocky material from the comet wouldn't be expected to evaporate that quickly.

"I'd like to know what happened to our half mile of material that was going around the sun."

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