If the comet ISON makes it out intact from its encounter with the Sun this week, the Earth is in for a potentially dazzling sight in the December night skies as it passes close to Earth and out ...

In a reversal that would make a comic book writer blush, scientists seem ready to resurrect Comet ISON after its untimely Thanksgiving demise. Over the holidays, NASA brought leading astronomers ...

Comet ISON, a dirty snowball from the beginning of Solar System time, circled the sun in a cloud of debris until something bumped it off track a few million years ago and 4.5 trillion miles away. ISON ...

(Update: Thanksgiving Day, 2:18 PM ET: Astronomers working with NASA’s Comet ISON Observing Campaign (CIOC) continue to monitor ISON’s progress as it swings around the sun. No word yet on its ...

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A comet is heading for a close encounter with the sun later this month, and if it is not vaporized or torn apart, it should be visible to the naked eye in December. Comet ISON is expected to pass ...

Comet Ison is looking pretty good as it approaches the sun, with a big, long tail and a greenish hue. Astronomers still don’t know if it will survive this passage intact and have enough volatiles ...