Extras

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?

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