Extras

    Video thumbnail: NOVA Are We Alone? Preview

    NOVA

    Are We Alone? Preview

    Hunt for clues in the universes to answer one of humanity’s biggest questions.

    Are We Alone? Preview

    Video thumbnail: NOVA The Mystery of Tabby’s Star

    NOVA

    The Mystery of Tabby’s Star

    Tabby’s star flickers erratically and no one knows why—could it be an alien megastructure?

    The Mystery of Tabby’s Star

    Video thumbnail: NOVA Profile: Jason Kalirai

    NOVA

    Profile: Jason Kalirai

    Astrophysicist Jason Kalirai observes stars and searches for habitable planets.

    Profile: Jason Kalirai

    Video thumbnail: NOVA Can We Use Pollution to Find Aliens?

    NOVA

    Can We Use Pollution to Find Aliens?

    The hunt for pollution in other planets’ atmospheres may determine whether we are alone.

    Can We Use Pollution to Find Aliens?