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"Presents the mystery of UFOs, including current theories and famous examples"--Provided by publisher.

"Presents the mystery of aliens, including current theories and famous encounters"--Provided by publisher.

Bright lights move quickly in the sky. Strange shapes fly through the air. What are UFOs and where do they come from? Find out about unexplained objects in the

Describes some of the sightings reported about mysterious and sometimes unexplained objects in the skies.

People around the world share the same stories. They can recall memories of spaceships and strange beings. Are aliens visiting Earth? Find out about famous alie