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。

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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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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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