This must have been later in his life, since cosmic rays were mainly being discovered (as such) from 1912 onward. Robert Millikan coined the term "cosmic rays" in the 1920s. Units of the power from cosmic rays are not terribly informative (electron volts per cubic centimeter?), but the general result is that the incoming power from cosmic rays is about equal to the light power coming from the distant stars. Not Very Much. Tesla was wrong to suppose they moved faster than light. He was on the right track in referring to them as particles, not waves.
This must have been later in his life, since cosmic rays were mainly being discovered (as such) from 1912 onward. Robert Millikan coined the term "cosmic rays" in the 1920s. Units of the power from cosmic rays are not terribly informative (electron volts per cubic centimeter?), but the general result is that the incoming power from cosmic rays is about equal to the light power coming from the distant stars. Not Very Much. Tesla was wrong to suppose they moved faster than light. He was on the right track in referring to them as particles, not waves.