New Earth-Size, Habitable-Zone Planets - Wonderful & Grim News At The Same Time

NASA recently announced that they found a planetary system that has seven Earth-like planets [https://exoplanets.nasa.gov/news/1419/nasa-telescope-reveals-largest-batch-of-earth-size-habitable-zone-planets-around-single-star/] . Three out of which are in a habitable zone… this made me excited and worried at the same time. Why It's Great News? This kind of discovery…