By reprocessing and combining several images during the three years it took to complete the project, the researchers recovered a quantity of light from the outer zones of the larger galaxies.
The IAC researchers said: “Recovering this light, emitted by the stars in these outer zones, was equivalent to recovering the light from a complete galaxy.”
This missing light has now shown some galaxies to have diameters almost double as previously believed.
Alejandro Borlaff, the IAC team’s project leader, said: “What we have done is to go back to the archive of the original images, directly as observed by Hubble, and improve the process of combination.
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