什么？人造衛(wèi)星還能這樣拍！

What are all those streaks across the background? Satellite trails. First, the foreground features picturesque rock mounds known as Pinnacles. Found in the Nambung National Park in Western Australia, these human-sized spires are made by unknown processes from ancient sea shells (limestone). Perhaps more eye-catching, though, is the sky behind. Created by low-Earth orbit satellites reflecting sunlight, all of these streaks were captured in less than two hours and digitally combined onto the single featured image, with the foreground taken consecutively by the same camera and from the same location. Most of the streaks were made by the developing Starlink constellation of communication satellites, but some are not. In general, the streaks are indicative of an increasing number of satellites nearly continuously visible above the Earth after dusk and before dawn. Understanding and removing the effects of satellite trails on images from Earth’s ground-based cameras and telescopes is now important not only for elegant astrophotography, but for humanity’s scientific understanding of the distant universe.

影像背景中的那些條紋是什么？人造衛(wèi)星的光跡。首先，這幅主題影像的前景為美麗的尖峰石陣。它是位在西澳大利亞．南邦國(guó)家公園內(nèi)的不尋常尖頂石柱群，這些尖頂石柱的形成原因不明，成份為遠(yuǎn)古海貝（石灰?guī)r），高度則與人相當(dāng)。然而更吸睛的，反而是它們后方的天空。由反射陽(yáng)光的低地球軌道衛(wèi)星所產(chǎn)生、記錄于不到2小時(shí)期間的這些條紋，先經(jīng)過(guò)數(shù)位疊加，然后再與同一部相機(jī)在相同位置拍攝的前景影像組合成這幅主題影像。其中大多數(shù)光跡是由發(fā)展中的星鏈網(wǎng)之通信衛(wèi)星所造成的，但有些不是?？偠灾@些條紋代表在黃昏后和黎明前的地球夜空中，幾乎會(huì)不間斷的見(jiàn)到數(shù)量愈來(lái)愈多的人造衛(wèi)星。了解和去除影像里的衛(wèi)星跡線(xiàn)，不僅對(duì)地基的相機(jī)和望遠(yuǎn)鏡如何取得美麗的天文影像頗為重要，也對(duì)人類(lèi)試圖理解遙遠(yuǎn)宇宙的科學(xué)探索工作很關(guān)鍵。

明日預(yù)告:?the galaxy cluster next door

最后，送一串彩色笑臉

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