Transcript: Although traditional SETI is conducted in terms of radio waves and their communication, it’s worth considering the possibility of optical SETI, using light waves to communicate through interstellar space. This has become possible due to current and modern technologies. For example, we have lasers which in a pulsed mode can outshine the Sun by a factor of ten thousand, if only for a microsecond or less. If such lasers existed on planets around nearby stars and were being pulsed in a meaningful way, these pulses would outshine the stars, and so the pulses would be visible from a very large distance. So in principle, optical intelligent signals could be seen. An even more sophisticated technique would involve a civilization aligning its signals with an intervening star or planet and using gravitational lensing to magnify, focus, and amplify the starlight, thus boosting the signal across large regions of space.