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Some exoplanets we look at could be looking back For many people worldwide, it’s hard to imagine with the vast numbers of stars in the universe and the vast number of planets orbiting those stars that we are all alone. So far, scientists have discovered more than 4000 planets orbiting distant stars, known as exoplanets. Astronomers from Cornell University recently published a study where they ask the question of out of all those exoplanets we are looking at from Earth, could any of them be looking back? Astronomer Lisa Kaltenegger says that the team asked who could’ve also spotted us.  The researchers  wanted to know which of the exoplanets could have determined that Earth has life from their vantage point. The astronomer worked with Joshua Pepper, an associate professor of physics from Lehigh University, to identify more than a thousand stars similar to our sun that could have Earth-like planets orbiting at a distance that can support liquid water. The researchers were clear that plan