美国国家航空航天局NASA每日一图(天文)-2017年7月29日

2017 July 29

Aurora Slathers up the Sky
Image Credit: Jack Fischer, Expedition 52, NASA
Explanation: Like salsa verde on your favorite burrito, a green aurora slathers up the sky in this June 25 snapshot from the International Space Station. About 400 kilometers (250 miles) above Earth, the orbiting station is itself within the upper realm of the auroral displays. Aurorae have the signature colors of excited molecules and atoms at the low densities found at extreme altitudes. Emission from atomic oxygen dominates this view. The tantalizing glow is green at lower altitudes, but rarer reddish bands extend above the space station's horizon. The orbital scene was captured while passing over a point south and east of Australia, with stars above the horizon at the right belonging to the constellation Canis Major, Orion's big dog. Sirius, alpha star of Canis Major, is the brightest star near the Earth's limb.

2017年7月29日

极光翱翔天空
图片来源: Jack Fischer, Expedition 52, NASA
说明: 就像你最喜欢的卷饼上的莎莎一样,一个绿色的 极光在6月25日的国际空间站快照中掀起了天空。地球以上约400公里(250英里),轨道站本身 在极光显示器的上限范围内。Aurorae具有在极端高度处发现的低密度下的激发分子和原子的 标志颜色。原子氧的排放主导了这一观点。 在较低的高度,诱人的辉光是绿色的,但是稀少的红色波带延伸到空间站的地平线之上。 轨道现场 在澳大利亚南部和东部经过一个点后被捕获, 右边的星星位于Canion Major的星座上,Orion的大狗。 天狼星,Canis Major的alpha明星,是地球四肢附近最亮的星星。

PS:前几天小编生(bi)病(shu)去了,没有更新,望谅解。

 

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