His mathematical theory explains known electromagnetic phenomena and predicts new ones.

They'd have to be, though I've never seen storms act quite like this, and the patterns don't fit any known phenomenon in the computer records.

No known natural phenomena would account for that beam.

It is not a version of known phenomena.

It exploits a known phenomenon where people focus on the most recent topic.

A second hypothesis is that the lights are the result of known geophysical phenomena, such as piezoelectrics.

No volcanic activity or other known natural phenomenon responsible.

This was a known phenomenon that had been noticed previously by other expeditions, but Scott took no measures to prevent it.

However the readings do not correlate with any known phenomenon.

The starships were simply not close enough together for any known natural phenomenon to destroy them all at once.