Cosmic rays are certainly a source of cancer (though, strangely, lack of cosmic rays is also potentially problematic; see https://www.frontiersin.org/articles/1

Cosmic rays are certainly a source of cancer (though, strangely, lack of cosmic rays is also potentially problematic; see https://www.frontiersin.org/articles/10.3389/fmicb.2017.00177/full https://www.frontiersin.org/articles/10.3389/fmicb.2017.0017... )