If intelligent life lived on planets 300 light-years away, they could spot us

Cornell University astronomer Lisa Kaltenegger explains that if there is intelligent life on planets 300 light-years away, they would be able to detect Earth's chemical traces. Kaltenegger and Lehigh University's Joshua Pepper have identified 1,004 main-sequence stars at that distance. Could there Earth-like planets be in those stars' habitable zones? -- Story: Aliens watching us? Scientists spot 1,000 nearby stars where E.T. could detect life on Earth: https://www.space.com/exoplanets-transiting-earth-life-detection-possible Credit: Cornell University