The original Deep Field photo revealed about 3,000 previously unknown galaxies in a patch of sky only 2.5 arc-minutes across, or about one 24-millionth of the whole sky.
The new fields will determine whether that huge haul was a fluke, or if almost any patch of blank sky contains a similar wealth of treasures."You don't know, it might be a special part of the sky you're looking at," Coe said.
Hubble will begin observing the first of the new fields later this year.
The nearly 23-year-old telescope is still going strong after five upgrades from visiting space shuttle crews. NASA hopes to keep the observatory running until at least 2018, when its successor, the James Webb Space Telescope, is due to launch.
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