Every so often, something comes outthat gives this theory new life, like the revelation...

[narrator] Every so often, something comes out
that gives this theory new life, like the revelation in 2017 that
the US government had spent millions on a secret program
to investigate UFO sightings. [narrator] But as almost any scientist
will tell you, looking into UFOs isn't the same
as searching for extraterrestrial life. The word UFO is
"unidentified flying object." It's unidentified