|Episode Online Video|
S05, E10 (First Aired:
Looking at the dark matter in the universe; Cosmologists need to figure out what dark matter is and if it could threaten the world of light.
S01, E07 (First Aired:
Using instruments that have only just been developed, a leading astronomer believes she may have already heard efforts of alien communications.
S03, E01 (First Aired:
Mankinds proof that we are not alone in the universe may mean the end of the world as we know it; it is uncertain if this would be good thing or a bad thing for humanity.