The age of the universe estimated in this way turns out to be just the reciprocal of the Hubble constant (that is, 1/H). This age estimate is sometimes called the Hubble time. For a Hubble constant of 20 kilometers/second per million light-years, the Hubble time is about 15 billion ...
Based on previous work, it is shown how a time varying gravitational constant can account for the apparent tension between Hubble's constant and a newly predicted age of the universe. The rate of expansion, about nine percent greater than previously estimated, can be accommodated by two specific...
Large dust reservoirs (up to approximately 108 M⊙) have been detected1–3 in galaxies out to redshift z ≃ 8, when the age of the Universe was only about 600 Myr. Generating substantial amounts of dust within such a short timescale has pro
分析:estimate的用法比较单一;1.be estimated to be/have/cost etcThe tree is estimated to be at least 700 years old.2.estimate something at somethingOrganizers estimated the crowd at 50,000.3.estimate thatScientists estimate that smoking reduces life expectancy by around 12 years on average.4.estim...
age-old 将“age of the universe"翻译成中文 宇宙的年龄是将“age of the universe"翻译成 中文。 译文示例:Some stars may even be close to 13.8 billion years old—the observed age of the universe. ↔ 多數恆星的年齡在10億至100億歲之間,有些恆星甚至接近138億歲 -可觀測宇宙的年齡。 age...
A. being B. to be C. which is D. is. 相关知识点: 试题来源: 解析(A) He doesn't know what's wrong with the computer, (B)The woman misunderstood what he said. (C)The problem is different from what he thought it was (D)The computer cannot be repaired反馈...
How do they know the universe is 13.7 billion years old? The value of 13.7 billion years for the age of the universe has been estimated by using a Hubble's constant H of approximately 71 km/s/Mpc, and plugging it into the following equation: Age of the Universe = 1/H This value...
Some other reports of decline that you may not have heard about. 您可能没有听说过的其他一些下降报告。 Last year, extreme poverty declined to its lowest level in human history, an estimated 8.4 percent. 去年,极端贫困率下降至人类历史上的最低水平,估计为8.4%。
Some other reports of decline that you may not have heard about.其他一些你可能没有听说过的 关于衰退的报道。 Last year, extreme poverty declined to its lowest level in human history, an estimated 8.4 percent.去年, 极端贫困降至 人类历史上的最低水平, 约为 8.4% 。
a r X i v : a s t r o - p h / 9 8 0 8 2 0 0 v 1 1 9 A u g 1 9 9 8 TheAgeoftheUniverse BrianChaboyer a a HubbleFellow,StewardObservatory,TheUniversityofArizona,Tucson,AZ, USA85721e-mail:chaboyer@as.arizona.edu Abstract Aminimumageoftheuniversecanbeestimateddirectlybydete...