Looking back over the past year, the editors of the Astronomy Picture of the Day (APOD) have decided to list 12 of the more memorable images posted to APOD in 2007.

回望过去的一年，“每日天文一图”(APOD)的编辑们决定在2007年APOD所展示的图片中选出更值得留念的12张图片。

youdao

Walter Lewin, though, has asked APOD to pose this as a challenge to astrophotographers: create a real single-exposure image of a clear night sky that features 360 degree star trails.

沃尔特·卢因通过APOD向广大天体摄影师发起挑战——拍摄一幅360度星流迹的单曝光晴朗夜空照片。

youdao