People have wondered if we're alone in the universe for centuries. Although men have landed on the moon and probes have been sent outside the solar system, there is still so much to explore.

The mysteries of outer space have drawn many people to search for evidence of alien life. But not all researchers focus on looking through a telescope. Plenty others spend their time watching the sky and documenting unidentified flying object sightings. As it turns out, Arizona is a hot spot for UFOs and those who believe in them.

In this week's episode of Valley 101, a podcast by The Arizona Republic and azcentral.com, we explored the unfamiliar world of UFOs and spoke to different people looking to answer the question: "are we alone in the universe?" 

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