A comet that could become one of the brightest ever seen when it flies by the sun this November is already remarkably bright and active, a new set of photos shows.
Comet ISON sports a well-defined tail of dust and gas even though it remains far from the sun, the new images from Hawaii's Gemini North Observatory reveal. But it's still too early to tell if ISON will live up to the "comet of the century" hype, researchers stress.
The new Gemini North images captured ISON from early February to early May of this year, when the comet ranged between 455 million to 360 million miles from the sun (730 million to 580 million km) — just inside the orbit of Jupiter.
Most comets develop a tail when they're near the main asteroid belt between Mars and Jupiter, because at this distance the sun's warmth begins sublimating their water ice to gas, researchers said. But ISON already had a tail when it was roughly twice this distance from our star, indicating that some other material was sublimating out.
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