| 单词 | ultraviolet dropout |
| 释义 | ultraviolet dropout n. 1. The disappearance of an extremely distant galaxy from a telescope image when viewed through an ultraviolet filter, caused by the absorption of the galaxy's emitted ultraviolet radiation by intergalactic hydrogen gas. 2. A technique that identifies galaxies as extremely distant by comparing images taken through visible light (in which distant objects are often detectable) and ultraviolet filters (in which they are not). |
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