"We have some really compelling evidence that we have neutrinos from beyond Earth's atmosphere and beyond the solar system," said study co-author Nathan Whitehorn, a physicist at the University of Wisconsin-Madison.
NEWS: Neutrino Halo May Change Supernova 'Flavor'
The number of events is too small to pinpoint the origin of the neutrinos, however.
"We do not yet have the number of neutrinos with which could paint a picture of the sky in the 'light of neutrinos,'" said Katz, who is leading the design of a rival neutrino observatory called KM3net, to be built underneath the Mediterranean Sea.
The next step will be answering questions such as where the neutrinos come from, what their energies are and what "flavor" they are (neutrinos come in three types). As IceCube gathers more data, " All of these questions are now starting to be addressed," Katz said.
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