When you link an Excel chart to a PowerPoint slide, the char…

Questions

Keck I     Keck cоnsists оf twо identicаl telescopes. Both hаve ten-meter mirrors mаde of 36 segments; with its support structure, each segment weighs close to a thousand pounds, costs close to a million dollars, and would suffice to create a fine, university-grade telescope on its own. The telescopes’ “tubes” are thin steel skeletons that look as delicate as spiders’ webs but are very precisely configured. “We use the telescope’s mission to motivate ourselves,” one Keck astronomer told me. “If a little wire or something is found intruding into the optical path, we think, “If the light has been traveling through space for 90 percent of the history of the universe, and it got this close to the telescope, we’d better make sure it gets the rest of the way.” Choose the best answer.Why do Keck’s astronomers (Paragraph I) worry if a wire goes loose?