The entities of light are perfectly harmless and do not pass through mortal flesh unless one of two factors occurs: 1. * Cadet Jennifer Hailey's theory: The moon's energy fields are in a state of magnetic flux while it passes over the magnetic pole of the gas giant it orbits, causing the light aliens to go into an angry frenzy. 2. * Major Samantha Carter's theory: The beings are capable of communicating and relaying threats to one another. Not only does this mean they're intelligent, but they are also territorial and possibly sentient.