A study published this week suggests that there may be "tens of billions" of planets in the Milky Way galaxy that fall within what scientists call "the Goldilocks zone," where the conditions for spawning life are thought to exist.
PARIS — Astronomers on Tuesday unveiled a haul of more than 50 planets orbiting other stars, including a "super-Earth" which inhabits a zone where, providing conditions are right, water could exist in liquid form.
