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。
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。
Of course, it has been extensively studied with ground-based observatories.
当然，它已被广泛研究的地面观测站。
Large astronomical observatories also take advantage of the calm Canary Island sky.
大型天文台也看中了加那利群岛宁静的天空。
Image above: Three of NASA's four Great Observatories are still in service. Credit: NASA.
四大观测器中，仍有三个在服役。
Image above: Three of NASA's four Great Observatories are still in service. Credit: NASA.
四大观测器中，仍有三个在服役。
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