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出典:『Wikipedia』 (2011/06/12 17:50 UTC 版)

英語による解説

引用

An astronomical visual source is an astronomical source of electromagnetic radiation in the visual (or visible) portion of the electromagnetic spectrum.These rays can be emitted, fluoresced, or reflected by an astronomical object. An astronomical object previously detected say in the ultraviolet portion of the spectrum and later observed with a visual (often called optical) observatory in orbit around Earth is also an astronomical visual source. Striving to understand the generation of visual rays by the apparent source helps to understand the Sun, the universe as a whole, and how these affect us on Earth.