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总结
多家媒体报道称，最新天文学研究与观测对“暗能量恒定不变、宇宙将永远加速膨胀”的主流图景提出挑战。部分学者认为暗能量可能随时间变化，宇宙的终局除“大撕裂”外，还可能转向“大挤压/大坍缩”，即在极漫长时间尺度上膨胀停止并反转，恒星与行星等物质逐步被引力拉回并汇聚到高密度核心，最终以巨大“火球”形式结束。相关结论仍具不确定性，需更多观测验证，但将影响对宇宙命运与基础宇宙学模型的理解。
正文
Universe will collapse into one big fireball, with stars and planets sucked into a core WION A twist in the tale: are scientists wrong about dark energy? The Hindu Big rip or crunch? What is the new theory that says the Universe may collapse into a massive fireball Times of India Is The Universes Endless Expansion In Doubt? Changing Dark Energy Sparks Fresh Cosmic Debate NDTV Dark Energy may be changing and with it the fate of the Universe BBC
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