While the search for exoplanets has revealed more than 4,000 planets beyond our solar system over the last couple of decades, it begs the question of what may be looking back.
원문출처 : https://www.cnn.com/2020/10/24/world/earth-in-sight-exoplanets-scn-trnd/index.html
원문출처 : https://www.cnn.com/2020/10/24/world/earth-in-sight-exoplanets-scn-trnd/index.html