哈勃望远镜

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“宇宙大片”看到了什么(科技大观)
Ren Min Wang· 2025-09-25 22:53
COSMOS—Web最令人震撼的发现是宇宙早期存在数量惊人的星系,这颠覆了以往的理论预期。它的观 测数据显示,在宇宙诞生后的最初5亿年内,星系实测数量是基于哈勃数据预测值的约10倍。这一发现 让天文学家深感困惑,因为按照标准宇宙学模型,大爆炸后物质需要相当长时间才能在引力作用下坍缩 形成恒星和星系。这些早期星系不仅数量惊人,其成熟度也超出预期。许多星系在宇宙年龄仅3亿至4亿 年时就已形成完整结构和成熟的恒星群体,其中一些星系的质量相当于10亿倍太阳质量。凯西认 为:"宇宙过早地产生了太多的光,它只有大约4亿年时间来形成约10亿倍太阳质量的恒星。我们尚不确 定这是如何实现的。" COSMOS—Web的另一个重大发现是大量超大质量黑洞在宇宙极早期的存在。这些宇宙"巨兽"通常位于 星系中心,质量相当于数百万至数十亿倍太阳质量。按照传统理论,它们需要数十亿年才能通过吸积物 质缓慢增长到如此规模。然而,COSMOS—Web数据显示,在宇宙年龄不足5亿年时,这些超大质量黑 洞就已经存在,它们与宿主星系共同演化的速度远超理论预期。这一发现不仅挑战了黑洞形成理论,也 迫使科学家重新思考星系与黑洞共生关系的本质——是黑洞先于宿 ...
超期服役的哈勃望远镜再续传奇
Ke Ji Ri Bao· 2025-05-19 22:30
Core Viewpoint - NASA celebrates the 35th anniversary of the Hubble Space Telescope, highlighting its significant contributions to space science and its ongoing relevance despite plans for a successor [4][6]. Group 1: Hubble's Achievements - Hubble has transformed human understanding of the universe, providing vivid images and numerous scientific breakthroughs since its launch in 1990 [4]. - The telescope has conducted nearly 1.7 million observations of approximately 55,000 astronomical targets, leading to over 22,000 published papers with more than 1.3 million citations [8]. - Hubble's unique ability to capture ultraviolet light allows it to observe celestial phenomena that ground-based telescopes cannot, achieving ten times the clarity of traditional ground-based observations [7]. Group 2: Current Status and Popularity - Despite being operational for 35 years, Hubble remains one of the most sought-after astronomical instruments, with the number of scientists applying for observation time being six times greater than the available slots [8]. - Hubble's data archive exceeds 400 terabytes, showcasing its extensive contributions to astronomical research [8]. Group 3: Future Considerations - Hubble is currently beyond its intended operational lifespan, with the last maintenance mission conducted 16 years ago, raising concerns about its future viability [9]. - NASA faces budget constraints, with funding expected to decrease significantly, complicating any potential maintenance or operational extension for Hubble [10].