When was the hubble space telescope launched by space shuttle discovery?
Eventually, following the resumption of shuttle flights in 1988, the launch of the telescope was scheduled for 1990. On April 24, 1990, successfully launched it during the STS-31 mission.
On what date was the hubble space telescope launched by space shuttle discovery?
April 24, 1990
Hubble Space Telescope
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What time was the hubble space telescope launched by space shuttle discovery?
12:33:51 UTC
Hubble Space Telescope
https://en.wikipedia.org/wiki/Hubble%20Space%20Telescope
The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned both as a vital research tool and as a public relations boon for astronomy. 
Hubble Space Telescope
The Hubble Space Telescope, often referred to as HST or Hubble, is a space telescope that was launched into low Earth orbit on April 24, 1990 at 12:33:51 UTC, and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned both as a vital research tool and as a public relations boon for astronomy.  On April 24, 1990, successfully launched it during the STS-31 mission.