Thank you very much for the feedback !
Here is how I imagined the situation to develop in my setting:
The destruction of the ozone layer was an important part of the reasons for
the mass extinction event on my Pharos IV water world, with the UV radiati-
on killing much of the sea surface plankton, although most of the aquatic spe-
cies had less problems with UV radiation, because they were protected by
the water layer above them. They died because there was no more plankton
to feed on.
Since the supernova happened several centuries ago, and the star Pharos is
an F type star with a high amount of UV radiation in its spectrum, the ozone
layer has at least partially been restored naturally before the colonists arri-
ved.
However, the UV radiation level on Pharos IV is still very high, and the colo-
nists have to protect themselves accordingly.
As the colony is not exactly a wealthy one, the colonists probably will just
wait for the natural ozone layer to rebuild itself. It would be an interesting
idea to speed this up with laser satellites or thelike, but currently I do not
see how the colony could afford this.



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Being cheeky since 1985!

