NASA says the sightings can be explained by earthly phenomena like planes, balloons, and weather. The announcement comes from a year-long investigation into how NASA can better study UFOs. The report includes suggestions for new ways to study UAP and states that there's no evidence for alien visitors to Earth. AdvertisementAdvertisementWeather balloons could be mistaken for a UAP, NASA said. Spergel said their efforts might include starting a smartphone app to help the public quickly report UAP sightings without stigma.

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Persons: they're, there's, David Spergel, Senez Sudio, Bill Nelson, Nelson, James Webb, Nicola Fox, Spergel Organizations: NASA, Service, Pentagon, UAP, James Webb Space, Research Locations: Wall, Silicon