| 单词 | galaxies, classification |
| 释义 | galaxies, classificationgalaxies, classificationGalaxies may be classified according to a variety of criteria, including morphology (shape, concentration, and structure), spectroscopy (integrated spectrum, etc.) colorimetry (integrated color, etc.), photometry (luminosity, etc.), and unusual activity at various wavelengths (radio, infrared, X-ray, etc.). The Hubble classification is based on morphology whereas Morgan's classification is basically a quantitative spectroscopic classification. |
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