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Byline: Lisa Kaltenegger
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Enormous structure made of yellow hexagons; tiny people in clean suits
NASA A view of the James Webb Space Telescope in 2017, from the NASA Goddard cleanroom observation window.

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Could alien astronomers have spotted Earth?

In an op-ed on CNN, Lisa Kaltenegger explains how she and other astronomers look for life beyond Earth – and how technologically advanced extraterrestrials might look for us.
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