改进
发表于 2025-3-27 00:24:15
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–吃
发表于 2025-3-27 02:05:34
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奴才
发表于 2025-3-27 08:39:02
https://doi.org/10.1007/978-1-4613-0611-5biguously identified. In Figure 10.1 the spectrum of another quasar, 1209+107, obtained with a photon-counting detector, is shown: in addition to the 3 emission lines (Lyα, N Vλ1240, and Si IVλ1393), 19 absorption lines were detected.
大沟
发表于 2025-3-27 12:41:27
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magnanimity
发表于 2025-3-27 16:07:10
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类人猿
发表于 2025-3-27 21:11:47
Extragalactic Radio Sources,nd 1948 and simultaneously in Britain by Ryle and Smith; the resolution obtained was of the order of 10′) before the radio emission could be better localized and possibly associated with a known object.
骨
发表于 2025-3-28 01:15:48
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放肆的我
发表于 2025-3-28 05:57:27
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countenance
发表于 2025-3-28 08:11:05
https://doi.org/10.1007/b115020ects in total). The apparent magnitude is equal to −2.5 log (luminosity). The eye can only perceive stars up to a magnitude . = 6. Up to an apparent magnitude . = 17.5 there are 500 000 galaxies, and up to . = 23, 10.. The first step in getting to know the galaxies better is to describe the various
矿石
发表于 2025-3-28 11:05:56
https://doi.org/10.1007/978-1-4613-2423-2 unequalled radial extension, the gaseous HI component generally exceeding the optical limit in the outer regions of galaxies. This confirmed in a striking way that the rotation curves remain flat at a large distance from the centre: does an enormous quantity of invisible mass then exist beyond the