| 单词 | event horizon |
| 释义 | > as lemmasevent horizon event horizon n. (a) Physics the boundary of a region in space-time having the property that no event within that region can have a causal relationship with any external future event; esp. such a boundary associated with a black hole, beyond which neither electromagnetic waves nor matter can escape; (b) figurative a point of no return or at which something is not perceptible or knowable. ΘΚΠ the world > the universe > star > kind of star > black hole > [noun] > boundary of event horizon1956 Schwarzschild sphere1969 1956 W. Rindler in Monthly Notices Royal Astron. Soc. 116 663 An event-horizon, for a given fundamental observer A, is a (hyper-) surface in space-time which divides all events into two non-empty classes: those that have been, are, or will be observable by A, and those that are forever outside A's possible powers of observation. 1978 Financial Times 21 June 18/3 He has been pressing for greater recognition of the importance of the silicon chip revolution, and argues that we have crossed a major ‘event horizon’. 1986 M. K. Munitz Cosmic Understanding v. 167 The observable universe will also have an event horizon. 1998 K. Eshun More Brilliant than Sun v. 67 The beat is the ballast which prevents escape velocity, which stops music breaking beyond the event horizon. 2008 T. Bevel & R. M. Gardner Bloodstain Pattern Anal. (ed. 3) xiv. 319 The crime scene analyst's event horizon is the why of crime; it is a point beyond which we cannot see. 2016 Daily Mail (Nexis) 30 June (Science section) Black holes do not give off any light beyond their event horizon, meaning they cannot be observed directly and can only be inferred by their effect on objects around them. < as lemmas |
| 随便看 |
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。