Extras
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?
Astrophysicist Jason Kalirai observes stars and searches for habitable planets.
Profile: Jason Kalirai
Hunt for clues in the universes to answer one of humanity’s biggest questions.
Are We Alone? Preview
Tabby’s star flickers erratically and no one knows why—could it be an alien megastructure?