Which NASA product development project overcame significant manufacturing challenges to create a space telescope with a 2.4-meter primary mirror capable of observations free from Earth's atmospheric distortion?

The development of astronomical observation equipment has evolved dramatically over centuries, with certain innovations marking pivotal moments in our ability to study the cosmos. This poll tests your knowledge about a significant product development milestone in modern astronomy that revolutionized space observation and our understanding of the universe.

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Hubble Space Telescope (launched 1990)
Kepler Space Telescope (launched 2009)
Chandra X-ray Observatory (launched 1999)
Spitzer Space Telescope (launched 2003)