Copyright:Joao Yordanov Serralheiro
中文翻譯:
在英國劍橋的Mullard Radio Astronomy Observatory，有一個特別大的圓形天線，直徑有60英尺，叫做One-Mile Telescope。這個天線在夜空中朝上指著星星，真是太壯觀了！為了捕捉這個美麗的場景，天文學家們用了90分鐘拍攝，連續拍了多達30秒的照片。這些照片合在一起，展示了星星如弧形圓圈一樣的美麗軌跡，這是因為地球一天的轉動造成的變化。而在這些星星的軌跡中，你可以看到北極星，它就在圓圈的中間，那是非常明亮的星星。One-Mile Telescope不僅看星星，它還用地球的轉動來探索宇宙，是第一個使用地球轉動來製作無線電圖像的望遠鏡。透過這項技術，它可以更清晰地觀察到天上的無線電源，就像把宇宙的圖片更清晰地呈現給我們一樣！
原文:
The steerable 60 foot diameter dish antenna of the One-Mile Telescope at Mullard Radio Astronomy Observatory, Cambridge, UK, is pointing skyward in this evocative night-skyscape. To capture the dramatic scene, consecutive 30 second exposures were recorded over a period of 90 minutes. Combined, the exposures reveal a background of gracefully arcing star trails that reflect planet Earth’s daily rotation on its axis. The North Celestial Pole, the extension of Earth’s axis of rotation into space, points near Polaris, the North Star. That’s the bright star that creates the short trail near the center of the concentric arcs. But the historic One-Mile Telescope array also relied on planet Earth’s rotation to operate. Exploring the universe at radio wavelengths, it was the first radio telescope to use Earth-rotation aperture synthesis. That technique uses the rotation of the Earth to change the relative orientation of the telescope array and celestial radio sources to create radio maps of the sky at a resolution better than that of the human eye.
來源:NASA每日圖片
