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摘要
摘要
Explore a galactic marvel a billion billion times more powerful than the sun-violent explosions, or death stars, that baffled astronomers for over 30 years. Venture into deep space to explore how these intense celestial phenomena were detected and discover how their secrets can teach us about the dawn of the universe.
评论 (2)
《学校图书馆杂志》(School Library Journal)书评
Gr 7 Up-Narrated by Stacy Keach, Death Star is about the 30-year search for the source of gamma-ray bursts first detected in 1967 by satellites looking for evidence of Soviet nuclear testing on the moon. The question that kept scientists occupied until the late 1990s was what could cause such big bursts, and how far away were they? The source, ultimately, turned out to be very distant "hypernovas" stars 30 times bigger than the sun collapsing into black holes and massively converting matter to energy. The story of how scientists followed the trail from the initial evidence of gamma-ray bursts is fascinating. In this video, astrophysicists and radio astronomers do their best to explain the physics involved for lay viewers, and their own enthusiasm as well as disappointments come across clearly. The title of the video comes from the fact that such hypernovas undoubtedly destroy any planetary systems in their vicinity. However, these scientists don't believe that any of the stars near our galaxy are likely candidates, so the title as well as Keach's narration comes across as overly dramatic. Production values are good, and the illustration of the scientific method in action makes this an appropriate choice for high school students.-Sarah Flowers, Santa Clara County Library, Morgan Hill, CA (c) Copyright 2010. Library Journals LLC, a wholly owned subsidiary of Media Source, Inc. No redistribution permitted.
《图书馆杂志》(Library Journal )书评
The source of outer-space gamma-ray bursts that are a billion times more luminous than our sun eluded astronomers for 30 years. What started as a Cold War search for Soviet nuclear explosions became a search by an alliance of the world's top scientists to find the true source. The false theories and fierce professional competition are depicted through interviews with the major astronomers involved. The story becomes increasingly more cosmic when the bursts are found to be billions of light years away and were the largest explosions since the Big Bang. Finding traces left of these massive explosions and their deadly energy bursts finally allowed astronomers to understand them and perhaps answer one of humankind's most fundamental questions: Where are the intelligent civilizations in the universe? Another well-done NOVA science program, this is recommended for public libraries.-Michael Schau, Seminole Community Coll., Sanford, FL (c) Copyright 2010. Library Journals LLC, a wholly owned subsidiary of Media Source, Inc. No redistribution permitted.