It is the fourth and final of NASA 's Great Observatories.

这是第四个与美国宇航局氏大天文台决赛。

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This composite image uses data from three of NASA's Great Observatories.

这张合成图像使用来自美国宇航局的大天文台三个数据。

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The last of NASA's Great Observatories, Spitzer is a space-based infrared telescope.

斯皮策红外太空望远镜是美国国家航空航天局最新的一个大型观测平台。

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It has orbited great observatories that have unlocked the secrets of the universe.

CNN: Commentary: Let's aim for Mars

Fermi and a laundry list of the world's great observatories on the ground and in space were all watching because of a coordinated plan to study Markarian 421 across a number of "colours" of light from radio to gamma-ray.

BBC: Blazar Markarian 421's flare-up is cosmic coincidence