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The entire Shuttle program was worth it just for Hubble, in my opinion. It's hard to understate the effects on cosmology that piece of kit has had. Truly a Plato's Cave moment.

If it were up to me, I'd launch seven Hubble replacements named after each of the astronauts lost in Columbia.

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Hubble could have been done without the Shuttle, and for a small fraction of the > $200B cost of the entire Shuttle program. This is true even if multiple Hubbles would have had to have been launched in lieu of repair missions (and making a series of them would have accrued considerable economic benefit from economies of scale and experience.)

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