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Within Reach: 30 Habitable Worlds May Soon Be Discovered For centuries, humanity has gazed at the night sky wondering whether we are alone in the universe. Earth remains the only planet known to harbour life, sustained by the presence of liquid water. While single-celled organisms emerged soon after our planet formed, it took nearly three billion years before complex life evolved--and humans have existed for less than one ten-thousands of Earth's history. This vast timelines suggests that while life may be common on water-rich worlds , intelligent, space-faring civilizations could be extremely rare. To encounter such life, humanity may one day need to journey beyond our solar system. But the challenge lies in distance: the immensity of space and the speed-of-light barrier limit how far we can travel. Only the stars closest to the Sun offer possibility of being reached within a human lifetime--even by robotic probes. Why Nearby Sun-Like Stars Are Prime Targets Not every star is sui...