例句與造句

1. Over the years, scientists refined their classification of stars.
2. Together with Philip Keenan, Morgan developed the MK system for the classification of stars through their spectra.
3. O type and B type stars are a classification of stars that strongly emit ultraviolet ( UV ) radiation.
4. He was studying the relationship between the spectral classification of stars and their actual brightness as corrected for distance their absolute magnitude.
5. Philip C . Keenan, whose work in the spectral classification of stars helped astronomers understand the chemical evolution of galaxies, died Thursday at a hospital in Columbus, Ohio.
6. It's difficult to find classification of stars in a sentence. 用classification of stars造句挺難的
7. In astronomy, stellar classification is a classification of stars based on their excitations are most prominent in the light, giving an objective measure of the temperature in this chromosphere.
8. In astronomy, "'stellar classification "'is a classification of stars based on their absorption lines, each line indicating a certain ion of a certain chemical element.
9. The spectral classification of stars, which is primarily a determination of surface temperature, is based on the relative strength of spectral lines, and the Balmer series in particular is very important.