S0- 102 is a star that is located very close to the centre of the Milky Way,near the radio source Sagittarius A*, orbiting it with an orbital period of 11.5 years.
Nineteenth-century Austrian physicist Christian Dopplerrealized that the wavelength that you measure will change if the source of the waves is moving relative to you.
几个星期,引力波源在椭圆形星系边缘,称为NGC4993,是天空中最眩光的地方。
For weeks, the gravitational wave source, near the fringe of an oval-shaped galaxy called NGC 4993, was the most stared-at spot on the sky.
上述的表达式常用于近似计算。由于波源谱宽的定义较为含混,相干长度的下述定义被提出:.
The expression above is a frequently used approximation.Due to ambiguities in the definition of spectral width of a source, however, the following definition of coherence length has been suggested:.
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