Which space telescope, launched in April 1990, revolutionized astronomy with its unobstructed view from above Earth's atmosphere and continues operating over 30 years later?

The launch of groundbreaking scientific instruments has often transformed entire fields of research. From microscopes that revealed the previously invisible to space telescopes that expanded our view of the cosmos, these technological marvels have accelerated scientific progress. This poll tests your knowledge about a particularly significant product launch that changed how scientists observe our universe.

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Hubble Space Telescope
Kepler Space Telescope
Chandra X-ray Observatory
Spitzer Space Telescope