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On Saturday morning, the Ariane 5 rocket must carry nearly seven tons of expensive equipment into space. The Ariane 5 should push Webb into space within 27 minutes, but it will be another six months before the telescope can begin conducting science. That's how long its "commissioning" will take — a process that involves unfolding, aligning mirrors, cooling, and calibrating instruments. It will take about a month just for Webb to reach its destination — an orbit around the sun, trailing Earth by 1 million miles, which is about four times the distance between the moon and Earth.
Along the way, the telescope must unfold itself. Webb is comprised of two major components: a hexagonal mirror made of 18 gold-coated segments and a sunshield the size of a tennis court. Both were too large to fit in any existing rocket, unless NASA folded them up like a drop-leaf table. The sunshield blocks the heat of the sun, allowing Webb to cool to a frigid minus degrees Fahrenheit — far colder than any place on Earth. Webb must reach this low temperature in order to detect the faint heat of distant stars and planets, in the form of infrared light.
It will take Webb about two months to cool. After unfolding, Webb will spend about four months aligning and focusing its mirrors. Then the observatory must calibrate its science instruments: four cameras and spectrographs designed to observe the universe in different wavelengths of infrared light. In addition to technical and schedule challenges, Webb's long journey to launch has stirred controversy. More than 1, people, including scientists who applied for observing time with Webb, signed a petition to rename the telescope earlier this year.
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