Astronomy Picture of the Day—阿尔卑斯上空的猎户

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2019 March 1

Orionover the Austrian Alps

ImageCredit & Copyright: Lukáš Veselý

Explanation:Do you recognize this constellation? Through the icicles and past the mountainsis Orion, one of the most identifiable star groupings on the sky and an iconfamiliar to humanity for over 30,000 years. Orion has looked pretty much thesame during the past 50,000 years and should continue to look the same for manythousands of years into the future. Orion is quite prominent in the sky thistime of year, a recurring sign of (modern) winter in Earth's northernhemisphere and summer in the south. Pictured, Orion was captured recently abovethe Austrian Alps in a composite of seven images taken by the same camera inthe same location during the same night. Below and slightly to the right ofOrion's three-star belt is the Orion Nebula, while the four bright starssurrounding the belt are, clockwise from the upper left, Betelgeuse, Bellatrix,Rigel, and Saiph.

奥地利阿尔卑斯上空的猎户

解释：你认识这个星座吗？穿过冰柱，越过山脉的正是猎户座，天夜空中最容易辨认的星座之一，它是人类非常熟悉的图腾。猎户座在过去5万年里看上去都大致相同，在未来数千年里也仍将继续保持原样。每年的这个时间段，猎户座在天空中都显得十分醒目，是北半球的冬季和南半球的夏季出现的标志。图为摄影师在奥地利的阿尔卑斯上空拍摄到的猎户座，同一个夜晚，在同一个地点用同一架相机拍摄的7幅影像合成。在猎户三星腰带的下方略偏右是猎户星云，而围绕腰带的四颗亮星，从左上方开始按顺时针方向，依次是参宿四、参宿五、参宿七和参宿六。

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