“张光学”是个多义词，它可以指张光学（广州海洋地质调查局副局长）, 张光学（中国计量学院能源工程研究所研究员）。
这张NGC 6240（星系）的图片是来自钱德拉（X射线天文台）新X射线数据（如图中红、橙、黄部分所示）和哈勃望远镜于2008年首度公开的一张光学图像两者合成的。
This image of NGC 6240 contains new X-ray data from Chandra (shown in red, orange, and yellow) that has been combined with an optical image from the Hubble Space Telescope originally released in 2008.
光学望远镜在数角秒内就能获取一张星空图—至少比肉眼能获取的大60倍。
Visible light telescopes can resolve a piece of sky just a few arc seconds across — at least 60 times a smaller patch of sky than can be resolved with the human eye.
本文介绍了一种光学成像技术，采用这种技术可以得到一张面目全非的照片。
An optical imaging technique was presented, by which a picture can be changed beyond recognition.
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