Bill Nye, among others, has speculated that "We May Discover Life on Europa."
With the landing of a probe on comet 67P, excitement has centered on the idea that life arose in water carried here by comets.
At best, closely examining a comet may illustrate a scenario whereby organic molecules were delivered to our planet, or to another.
Cosmologists Hiranya Peiris and Matt Johnson seek evidence in the cosmic microwave background (CMB) for past collisions of bubble universes with our own.
Since there are so many planets in the galaxy and universe, it’s natural to assume that there must be other intelligent life forms out there.