How Many “Other Earths” Are There? Maybe Billions.

Researchers at the University of Auckland in New Zealand expect to find 100 billion celestial bodies similar to Earth using a new method called “gravitational microlensing”, which measures the deflection of light from distant stars as it passes through a planetary system. The research won’t prove there’s life on these other Earths—but giddy scientists say this would be a big step along the way.