LZ见到的太阳爆炸的原文是这个吗？ Astronomic observations with the latest and greatest telescopes are leading astronomers to embrace the idea that stars usually form in clusters, even if they end up, like our Sun, isolated from other stars. Cosmochemists using optical microscopes, electron microscopes, and mass spectrometers are finding evidence supporting the idea, along with important details about the star-forming regions and about the earliest history of the Solar System. The latest breakthrough is reported by Martin Bizzarro and his colleagues at the Geological Institute and Geological Museum in Denmark, at the University of Texas, and at Clemson University in South Carolina. They made high-precision measurements of iron and nickel isotopes. The results show that the oldest planetesimals to form in the solar system did not contain any iron-60 ( 60Fe), which decays to nickel-60 ( 60Ni) with a half-life of only 1.5 million years, yet somewhat younger materials did contain it. In contrast, aluminum-26 ( 26Al), with a half-life of 740,000 years, was relatively uniformly distributed. The 60Fe cannot have come from a source too far from the infant Sun. If too far away it would decay before arriving or be so diluted that we could not measure it. The exploding star had to be in the Sun's general vicinity. It was a cluster mate of the Sun. One type of massive star is called a Wolf-Rayet star (named after the discoverers). In these large objects, elements formed inside by nuclear fusion, such as oxygen and aluminum, migrate toward the surface. This concentration of material begins to adsorb light from inside, eventually resulting in strong winds blowing off the surface and into interstellar space. The winds are shown in the image, below, taken in the infrared. Astronomers believe that most massive stars (those >20 times the mass of the Sun) go through a Wolf-Rayet phase, which ends when they explode as supernova. lz觉得这个题选哪个啊？ 其中在第二还是第三段有个问题，就是说如果观察到的现象不是这样的话会发生什么事，选项有： 1、那么太阳产生的时候就是应该是和stars们成一个 claster（可能没拼对） 2、那么太阳和stars就会disperse什么的 -- by 会员 h654230986 (2011/10/14 23:24:21)
就是这个原文。。可是貌似没有碰到这个题目唉。。。爱莫能助。。。 | 
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发表于 2011-10-15 00:34:50
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