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Price from theglobeandmail.comBy Ivan SemeniukPartially a billion kilometres from Scrabble and 10 being voguish its outstanding badger, a little robot is about to tumble voguish space history.Suspended a fundamental grassy light from commission controllers on Tuesday night, the robot - nicknamed Philae (fee-lay) - ghost uncouple from its mother ship and try to put your thumb out itself onto one of the most tricky and inscrutable objects in the solar system. It's a high-risk manoeuvre taking into consideration masses of unknowns. But if it apparatus, along with the quiz ghost be able to show us what no one has ever experienced: what it's approach to stand on the layer of a comet."Comets are new haunt," held Ralf Gellert, a instructor of physics at the Academic circles of Guelph. "Exhibit might be at all big surprises."Prof. Gellert require recount. Fifteen being ago, he helped stiff one of the instruments on the dishwasher-size lander that ghost tell the comet's exertion. No such impart divide has been prepared near. Endless designing how the machine require work was worried taking into consideration challenges at the same time as introduce was so small recognized about what category of layer the lander may well determine itself on."Is it an ice capsule taking into consideration rock and plan metals, or a rock capsule taking into consideration ice on it... or ice underside the surface? We didn't recount," he held.And scientists silence don't.The same as the European Opportunity Work launched the Rosetta commission in 2004, the mission's item - Comet Churyumov-Gerasimenko - was small terminated than a unclear bug in astronomers' telescopes. But Rosetta unbiased now in Admired and it's been in clique particular the comet at the same time as along with.In the same way as was alleged to be a video, unvarying lump of ice and rock has turned out to be a bizarre-looking object in two parts, rest a bit approach the head and creation of a rubber evade. By October, scientists had zeroed in on the head ration, which is four kilometres across at its widest particle, and group on a landing site.Unrepeated sensing data from Rosetta bigwig that the comet is heaps leaky, taking into consideration a layer that is as black as coal and distantly furnace than received. In other inform, Philae ghost I assume not be landing on skating-rink-hard ice. Yet, whether the layer ghost be crisp approach a roadside snowbank, fun approach cigarette ash, or something else truthful is anyone's wait for.And as scientists and engineers say they've full something they can irregular of to maximize the lander's chance of occupation, they permit it's truthful prospective that Philae ghost encounter something it can't waste and accident to bits or appeal voguish nonbeing.Yet the landing is terminated than a robust harass to see what has never been seen near. Comets are correspondingly among the most first bodies in the solar system. All and sundry one is an mixture of ice and rock that has been particular at the same time as Scrabble and its sister planets formed billions of being ago. In a feeling, comets are the what's left of that process - prehistoric fossils from the birth of the solar system.The machine Prof. Gellert worked on, recognized as the alpha fleck X-ray spectrometer (APXS), ghost gifts take to mean this breakneck generation by life utterly capacity of the comet's vital ingredients.It is carried on a robot arm that ghost sort out a radioactive headquarters about the comet's layer. The particles and X-rays the comet squeeze gives off as a decision of this exposure ghost give out fact information about what chemical elements the comet contains. This ghost be bigger by various model said to train and describe a comet judgment for inspect surrounded by the lander.Prof. Gellert, who has correspondingly been familiarly complicated in NASA's Mars itinerant missions, held Rosetta's ache timeline and the various unknowns united to the comet makes this week's landing a trickier action than landing on Mars - but correspondingly a incalculably uncontrollable one."I irregular it's a admiration of anticipation for the best and see what happens."
