请生成一段英文段落，阐述外星生命存在的可能性。
The possibility of extraterrestrial life existing within our universe is a topic of great fascination and debate amongst scientists and the public alike. With billions of potentially habitable planets in our galaxy alone, it seems plausible that life could have arisen elsewhere. The discovery of extremophiles, organisms that thrive in extreme environments on Earth, also fuels speculation about the potential for life to exist in harsh conditions on other planets. Furthermore, the recent detection of exoplanets orbiting within the habitable zone of their stars, where liquid water could exist, has increased the likelihood that we may find evidence of extraterrestrial life in the near future. While we have yet to discover concrete evidence of alien life, the possibility remains intriguing and compelling.