Searching For Earth 2.0

From the 16th century onward, scientists began to understand that the stars in the heavens are suns much like our own. They started to wonder whether those other suns had their own planets. And if so, they wondered, could any of those planets be like Earth.

Profound questions, but how could we answer them? Stars are typically a million times brighter than the planets that huddle near them. This means a star’s light swamps the feeble glow of any nearby planet. It seemed the search for exoplan...