Spitzer Space Telescope (2003–2020)

Spitzer discovered seven Earth-sized planets orbiting the TRAPPIST-1 star in 2017, a feat that required 500 hours of infrared monitoring impossible for Hubble in optical light. Its 16-year mission mapped the Milky Way's spiral arms using 1.2 million infrared sources and peered through interstellar dust clouds to reveal star-forming regions 10 times fainter than any optical survey.

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