满月与蓝眼泪

2024年3月11日

A Full Plankton Moon
Credit & Copyright: Petr Horálek / Institute of Physics in Opava

Explanation: What glows in the night? This night featured a combination of usual and unusual glows. Perhaps the most usual glow was from the Moon, a potentially familiar object. The full Moon’s nearly vertical descent results from the observer being near Earth’s equator. As the Moon sets, air and aerosols in Earth’s atmosphere preferentially scatter out blue light, making the Sun-reflecting satellite appear reddish when near the horizon. Perhaps the most unusual glow was from the bioluminescent plankton, likely less familiar objects. These microscopic creatures glow blue, it is thought, primarily to surprise and deter predators. In this case, the glow was caused primarily by plankton-containing waves crashing onto the beach. The image was taken on Soneva Fushi Island, Maldives just over one year ago.

Your Sky Surprise: What picture did APOD feature on your birthday? (post 1995)

Tomorrow’s picture: horizon spiral

满月与蓝眼泪
影像提供与版权: Petr Horálek / Institute of Physics in Opava

说明: 夜晚有那些物体会发光呢？这幅主题影像，呈现了夜晚的一例寻常与不寻常的发光体之组合。其中，明月可能是最寻常、也是我们最为熟悉的发光体。由于观察者位于地球赤道附近，故所见的满月几乎垂直西落。当明月西沉时，地球大气里的空气和气溶胶偏好散射蓝光，使得这颗反射阳光的卫星，在地平线附近时带着泛红的色泽。而影像里最不寻常的光，则是来我们较陌生、由浮游生物所发出的生物光。这些微生物之所以发出蓝光，咸信是为了惊吓和震慑捕食者。在此例里，生物光主要来自携带浮游生物的海浪拍打沙滩所触发的。这幅影像是在1个多月前，摄于马尔代夫的索尼娃富士岛。

您的天空惊喜: APOD在你生日那天展示了哪张照片？（1995年后）

明日的图片: horizon spiral