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Subjects of IRS Pub. 590
Answer for the clue "Subjects of IRS Pub. 590 ", 4 letters:
iras
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The Infrared Astronomical Satellite ( IRAS ) was the first-ever space-based observatory to perform a survey of the entire sky at infrared wavelengths . Launched on January 25, 1983, its mission lasted ten months. The telescope was a joint project of the ...