08年五大天文新发现 Top 5 Amazing Astronomy Discoveries in 2008
发布: 2008-12-28 11:41 | 作者: webmaster | 来源: 本站原创 | 查看: 260次
3. 暗能量抑制星系生长
暗能量抑制星系生长
2008年，科学家在“神秘力量”——暗能量研究方面加紧了步伐。暗能量在宇宙中不断扩散并且速度越来越快。大约10年前，科学家发现了这种神秘力量。但科学家也承认，为了揭开“暗能量是什么”这个谜团，他们还有很长的一段路要走。借助于一种新手段，科学家证实了暗能量的存在，并发现这种神秘力量抑制宇宙星系生长。在一个受控于暗能量的不断膨胀的宇宙，星系彼此间飞离对方而不是混合和合并。研究发现显示，暗能量以爱因斯坦所说的“宇宙常数”这种形式出现。宇宙常数是爱因斯坦广义相对论中的一个术语，代表的是存在拥有密度和压力的真空区的可能性。
3. Dark energy
Scientists were hot on the trail this year of a mysterious "force" called dark energy that has been expanding the universe at an increasing pace and was only discovered about 10 years ago.
Though, admittedly, scientists say they are more than a few years away from solving the puzzler of what dark energy is, a new method this year confirmed its existence, suggesting the force is stifling the growth of galaxies in the universe. Basically, in an expanding universe dominated by dark energy, galaxies fly away from one another rather than mingle and merge.
These results also suggest dark energy takes the form of what Einstein called the cosmological constant — a term in Einstein's theory of general relativity that represents the possibility of empty space having a density and pressure associated with it.
