1. Messengers

In 2008, sightings of strange lights in the sky over Central Texas attract media attention and ridicule. New radar data supports eyewitnesses' claims.

3. The Broad Haven Triangle

A close encounter at a children's school in a tiny Welsh village spurs a series of sightings. An astrophysicist theorizes about aliens and water.

4. Lights Over Fukushima

After the 2011 Fukushima nuclear disaster, survivors reported seeing bright lights above the power plant. For some, the event upholds a long-held belief.