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These potentially habitable exoplanets can see Earth as it evolves By Ashley Strickland, CNN enablePagination: false Courtesy: OpenSpace/American Museum of Natural History (CNN)  As human civilization began to flourish on Earth about 5,000 years ago, 1,715 star systems within 326 light-years of Earth could have seen our planet over that time. And over the next 5,000 years, 319 more star systems will be able to see Earth. If there are exoplanets orbiting these nearby stars, they could witness our planet as it crosses in front of the sun. The observation of a passing of a planet in front of its host star is called a transit, and it s one of the main methods used by astronomers to detect exoplanets using ground- and space-based telescopes. And it s how other life on other planets, if it exists, could observe Earth.

Jackie fahertyLisa kalteneggerAmerican museum of natural historyEuropean space agency gaiaCarl sagan institute at cornell universityExoplanet survey satelliteCarl sagan instituteCornell universityAmerican museumNatural historyEuropean space agencyEarth transitMilky wayEarth transit zoneWebb space telescopeTransiting exoplanet survey satellite