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It may have taken more than a million years of travel to reach the inner solar system but when Comet ISON passes by the sun the show should be worth waiting for.ISON, named after the International Scientific Optical Network project will get as close as one million kilometres from the sun’s surface.But scientists aren’t sure how it will hold up – if the heat doesn’t kill it, the sun’s gravity may rip it apart.NASA scientist Dr Michelle Thaller:“If it actually crumbles into pieces, in some ways that’s better for scientists because we’ll be able to see inside the comet and see what the chemistry is like and that’s the whole point. This is a preserved bit of the early solar system and we really want to know what conditions were like four and a half billion years ago.”If ISON survives intact its closest point to the earth will come in a few days. Astronomers spotted the comet a year ago giving them plenty of time to prepare for the flyby. With so few comets making it into our solar system ISON is an eagerly awaited cosmic event.