Long exposure photograph of star trails above the Paranal Observatory in Chile. The Very Large Telescope (VLT) fires a laser beam from its Laser Guide Star (LGS) at the centre of our galaxy, in the heart of the brightest part of the Milky Way, creating an artificial star in the Earth's mesosphere. This artificial star is used as reference to correct images and spectra.

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TOP28946875

Source:

達志影像

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RM

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須由TPG 完整授權

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