内容来源：https://www.quantamagazine.org/astrophysicists-puzzle-over-webbs-new-universe-20260702/

内容总结：

韦伯望远镜颠覆宇宙认知：早期星系与黑洞挑战现有理论

自2022年詹姆斯·韦伯太空望远镜投入运行以来，它不断向人类传回关于早期宇宙的惊人发现，迫使天体物理学家重新审视业已建立的理论体系。从“小红点”神秘天体到“不可能存在”的超大质量黑洞，一系列异常现象正推动科学界掀起新一轮理论革新浪潮。

“小红点”之谜：黑洞还是新天体？

韦伯望远镜在宇宙大爆炸后约6.5亿年的时空中，发现了成百上千个此前从未被观测到的“小红点”。这些微小而明亮的红色物体究竟是何种存在？哥本哈根宇宙黎明中心的天体物理学家夏洛特·梅森提出了一个大胆假说：它们可能是一种名为“黑洞星”的全新天体——超级黑洞被厚厚的气体茧包裹，气体层像恒星大气一样发光。

然而，梅森团队最近对其中一个“小红点”的光谱分析显示，光线经过气体云时并未出现预期的改变。这一发现与现有模型相矛盾。“现在要重新开始，”梅森说，“如果我把气体云画成不均匀、有空洞的结构，或许就能得到更接近观测结果的信号。”

“不可能”的超大质量黑洞：生长速度之谜

韦伯望远镜持续发现早期宇宙中存在质量高达太阳数十亿倍的超大质量黑洞，其形成速度之快远超现有理论解释。普林斯顿大学天体物理学家珍妮·格林指出：“要在这么短的时间里长得这么大，你必须进行某种‘极限操作’。”

传统理论认为，黑洞受到“爱丁顿极限”约束，即吸积盘辐射压力会阻止物质过快落入黑洞。然而，最新计算机模拟显示，当吸积盘以特定方式膨胀时，涌入的气体可能压倒辐射压力，实现“超爱丁顿吸积”。2024年，韦伯望远镜更是观测到一个在大爆炸后约15亿年时，以爱丁顿极限40倍速率吞噬物质的黑洞。

此外，科学家还发现了另一个可能：约7.5亿年后的一个“小红点”被确认为“裸露”的超大质量黑洞，周围竟没有任何恒星。这暗示它可能通过“直接塌缩”机制，未经历恒星阶段而直接从巨大气体云形成。“目前显然存在我们尚未完全理解的黑洞增长差异，”格林说，“最激动人心的工作就是搞清楚这些差异的物理本质。”

早期星系亮度异常：理论解释百花齐放

同样令科学家困惑的是，韦伯望远镜观测到的早期星系异常明亮。有观点一度认为，这或许动摇了对宇宙基本物理规律的理解。但经过数年研究，理论家已提出多种模型：或是第一代星系将气体转化为恒星的效率远超预期，或是湍流环境导致恒星形成呈周期性爆发，或是早期恒星形成区域偏好产生超亮的大质量恒星。

巴黎天体物理研究所的哈基姆·阿特克表示，韦伯望远镜的中红外仪器揭示了另一个“惊人发现”：早期星系并不像科学家假设的那样特征相似，而是表现出惊人的多样性。有些星系似乎已经“清理”了所有星际气体和尘埃，就像“裸星”；另一些则富含气体。此外，一组星系发现含有过量氮元素，表明早期宇宙可能存在大量超大质量恒星。

宇宙黎明之谜：从虚无到生命

随着第一代恒星点亮宇宙，它们通过核聚变和超新星爆发，将氢、氦转化并播撒碳、氮、氧、磷、铁等重元素——这正是行星和生命诞生的原料。“我们正在回望创造我们的东西，”宇宙黎明中心的莉斯·克里斯滕森感慨道。

与哈姆雷特在艾尔西诺城堡中悲叹宇宙不过是“一团污浊有毒的气体”不同，研究宇宙起源的当代科学家们正为这些发现感到振奋。正如梅森所说，随着韦伯望远镜不断传回的数据，就像遥远的光子穿越亿万光年抵达地球，新的拼图碎片正在不断归位。

中文翻译：

天体物理学家对韦伯望远镜发现的新宇宙感到困惑
引言
当夏洛特·梅森思考宇宙奥秘时，她喜欢随手涂鸦。“我是个非常视觉化的人，”她说，“我通常会画很多图，试图理解正在发生的事情。”
梅森是哥本哈根宇宙黎明中心的天体物理学家，最近她一直在笔记本上画满“小红点”的草图——这是詹姆斯·韦伯太空望远镜（JWST）在图像中发现的数百个令人费解的天体。在2022年韦伯望远镜投入使用之前，这些小红点从未被观测到。但我们现在知道，它们大约在宇宙大爆炸后6.5亿年开始大量出现。
这些小红点只是JWST对早期宇宙观测中涌现出的激动人心的谜团之一。其他谜团还包括那些似乎与其年龄不符的庞大黑洞，以及挑战我们对宇宙大爆炸后最初十亿年认知的古老星系。起初，科学家们震惊不已：JWST揭示的宇宙与我们对天体物理学的理解根本无法吻合。如今，一波新理论提供了诱人的解决方案——但哪些才是真实世界的写照，仍是一个未解之谜。
最近的观点认为，小红点可能是被厚厚气体包裹的黑洞，或许代表了一种全新的天体类型，称为“黑洞星”，其紧密的气体外壳像恒星大气一样发光。
“这大概就是我的黑洞，”梅森说着画了一个小圆并涂满。“我可能会给它加一个盘，因为我们认为那里是部分辐射的来源。”她在圆中心划了一条线。“然后，最直观的图景就是黑洞周围这个稠密的气体云。”她在这个天体外面又画了一个大圆。
但梅森认为这些宇宙谜团可能还有更多内涵。她和同事最近分析了一个小红点发出的光谱。如果稠密气体云的模型正确，那么部分光线在经过气体时应该会发生改变——但他们的观测结果并非如此。
“现在该怎么办？重新开始。但如果我把气体画成团块状，”梅森说着，在黑洞周围的气体云中画了一个带有孔洞的新草图，“我应该能得到一个更接近的信号。”
在世界各地，像梅森这样的研究人员正在热切地拼凑JWST对远古宇宙的一瞥，以描绘出宇宙起源的更清晰图景。就像那些穿越数十亿光年到达地球的光子一样，新的碎片不断归位。
宇宙的无底深渊
由于JWST不断发现那些用现有理论无法解释的过于庞大——而且庞大得多——的古老黑洞，黑洞的故事变得更加复杂。
宇宙大爆炸后不久，宇宙基本是平坦而无特征的。然而，仅仅几亿年后，“我们就已经看到了质量达太阳十亿倍的黑洞在成长，”普林斯顿大学天体物理学家珍妮·格林说。“要让它们在如此短的时间内变得那么大，你必须费尽心思。”
科学家们关注影响黑洞大小的两个关键因素：黑洞“种子”在形成时有多大，以及这些种子随后增长的速度有多快。但很难解释黑洞是如何在宇宙早期就变得足够大、或者增长足够快，以达到太阳质量的十亿倍。
在当今宇宙中，当大质量恒星的核心耗尽燃料并坍缩时，就会形成黑洞。格林说，考虑到第一批恒星质量相当大，它们可能留下质量高达约100倍太阳质量的黑洞种子。
“我们知道这会发生，但要它们在如此短的时间内增长到十亿倍太阳质量真的非常非常困难，”她说。“你真的得强行喂食它们。”
科学家们历来认为黑洞的增长速度存在一个硬性上限。当物质落向黑洞时，会像水流入下水道一样旋转，从而变得炽热。这个“吸积盘”产生的辐射会阻碍更多物质飞入，阻止黑洞吞噬更多物质。这种吸食极限，即爱丁顿极限，应该使得黑洞在现有时间内不可能增长到数千万倍以上。
但最近的计算机模拟表明，黑洞可能存在某种“后门”。如果吸积盘以恰当的方式膨胀，涌入的气体就能压倒辐射压力。这种“超爱丁顿”吸积会导致气体以惊人速度涌入。
即便如此，天文学家也不知道当时是否有足够的气体来产生最大的黑洞。一些研究人员认为，古老的致密星团可能产生了大量黑洞种子，它们迅速合并。
或者，超大质量黑洞可能根本不是由恒星形成的。在这种情况下，巨大的气体云会直接坍缩成一个黑洞。这种“直接坍缩”机制可以形成一个质量约为太阳一万倍的种子。
“直接坍缩模型的问题在于它需要非常理想的条件，”格林说。要使直接坍缩发生，一个巨大的气体云必须一次性压缩成一个黑洞，而不能先分裂成会形成恒星的较小云团。这需要特定的气体化学成分，并且云团必须缓慢旋转。
“当人们在计算机中尝试这样做时，他们可以制造出这些直接坍缩黑洞，但无法制造出足够多的数量来解释我们观测到的所有黑洞，”格林说。
每种理论都有一些证据支持。2024年，JWST观测到宇宙大爆炸后约15亿年的一个黑洞，以大约40倍爱丁顿极限的速度吞噬物质。如果宇宙早期更早的黑洞也以这种方式“暴饮暴食”，那么其中最大的黑洞可能起源于相对较小的种子。
然而，最近研究人员对一个宇宙大爆炸后约7.5亿年的小红点进行了长时间观测，该红点受到前景星系团的引力透镜效应。他们得出结论，这个天体是一个“裸露的”超大质量黑洞，估计质量为太阳的5000万倍，周围没有可辨别的恒星。如果这个质量估计正确，那么这意味着该黑洞可能是在任何星系形成之前，作为一个大种子（可能通过直接坍缩）形成的。
“黑洞的成长方式显然存在我们尚未完全理解的差异，”格林说。“所以对我来说，现在最令人兴奋的事情就是试图从物理上理解：到底有什么不同？”
构建星系
就像早期看起来过大的黑洞一样，JWST发现的许多早期星系也显得过亮。为了找出原因，研究人员正在重新评估他们关于星系如何形成的观点。
与今天相比，宇宙大爆炸后约2亿年，初生宇宙又小又密又热。随着它膨胀和冷却，暗物质聚集成科学家称为“晕”的巨大团块。这些无光晕的引力将氢气和氦气拉成巨大的纤维状结构，汇聚在包裹它们的暗物质球核心。一旦足够的气体积累起来，极端压力就会点燃核聚变的火焰，点亮第一批恒星，它们聚集在一起形成了第一批星系。
天文学家通常用红移来描述这些事件的时间点，红移是指早期天体发出的光因宇宙膨胀而被拉伸的程度。
“直到红移约15时（大爆炸后2.7亿年），都没发生太多事情，然后大量气体开始沿着这些纤维结构涌入，”纽约熨斗研究所研究星系形成的高级研究科学家雷切尔·萨默维尔说。她正在2026年4月于丹麦赫尔辛格举行的一次会议上展示新的计算机模拟。在一个俯瞰波罗的海和北海之间海峡的会议室里，来自世界各地的100多名研究人员齐聚一堂，讨论宇宙婴儿期的谜团。暗物质、气体和星光的彩色可视化图像在投影屏幕上舞动。
“到红移约11时（大爆炸后4.2亿年），恒星形成速率开始真正提升，”她继续说道。“在红移9时（大爆炸后5.5亿年），我们制造出一个不错的星系。”
屏幕上的星系代表了早期星系群，但迄今为止JWST发现的最古老星系仅存在于大爆炸后2.8亿年。韦伯望远镜发现明亮早期星系的这一令人困惑的发现，最初让一些科学家认为，我们对基础宇宙学（即控制早期宇宙能量和物质行为的定律）的理解可能存在缺陷。但在对这些原始天体进行了几年研究后，理论家们现在有了几种模型来解释它们的亮度和丰度。
“我们几乎从看到太多早期星系，变成了有太多理论来解释它们，”萨默维尔对与会者说。
也许第一批星系将气体转化为恒星的效率比之前认为的更高。或者它们经历了由动荡条件驱动的周期性恒星形成爆发。又或者，早期恒星形成区域优先产生了大质量、极其明亮的恒星。许多天体物理学家认为，这些因素的某种组合（可能还有其他因素）促成了这些星系的发展。
为了验证这些新想法，研究人员正在通过模拟来探索婴儿宇宙。“实际上，自韦伯发射以来，特别是最近一年左右，数值模拟方面取得了非常显著的进展，”萨默维尔告诉与会者，并补充说这些新模拟“或许更适合、也更能为高红移宇宙的观测解释提供信息。”
随着这些模型的改进，JWST正在记录越来越多的星系。通过将其在早期宇宙中看到的情况与试图解释原因模拟进行比较，研究人员正在逐步接近揭示宇宙黎明的真实本质。
“我们可以尝试在模拟中找到与观测星系最匹配的类似物，”巴黎天体物理研究所（索邦大学）的天体物理学家哈基姆·阿泰克说。“一旦找到最佳匹配，你就可以研究恒星形成历史，因为在模拟中你可以获取星系的完整历史。”
一个有趣的线索最近来自JWST的中红外仪器（MIRI），这是一种超级冷却的设备，可以拆分遥远天体的光线。MIRI揭示出早期星系并不像科学家假设的那样具有相同特征。
“主要惊喜在于我们在早期时代看到的星系性质的多样性，”阿泰克说。“你原本预期它们看起来是一样的。”
这种多样性可能表明恒星形成是爆发式的，星系循环经历着恒星聚变、爆炸并排出气体云、从而停止恒星创造的过程，直到气体再次聚集并触发新一轮恒星诞生。
“其中一些星系，看起来它们清空了那里存在的所有星际介质，包括气体和尘埃。就像你只看到了裸露的恒星，”阿泰克说。“另一个星系则相反。它含有大量气体。”
进一步的线索来自一组氮含量过高的星系。这种元素的存在表明早期宇宙中可能存在着许多特别大质量的恒星。在模拟中，这些大质量恒星在超新星爆发并散布该元素到其宿主星系之前，会产生过量的氮。
总有一天，研究人员可能会揭示星系形成的全貌。在那之前，他们将继续在观测和模拟的新数据中筛选线索。
存在的谜题
一旦恒星之光点亮，宇宙便发生了转变。来自早期星系和黑洞的辐射电离了中性氢气的海洋，在宇宙迷雾中雕刻出巨大的气泡。研究人员称这一时期为再电离，因为这是宇宙第二次被电离。它标志着宇宙黑暗时代的结束，那时迷雾般的深渊中没有恒星。
第一批恒星被认为质量是太阳的数百或数千倍，它们猛烈地消耗着氢和氦燃料，并以强大的超新星爆发而告终，为宇宙播下了新元素，如碳、氮、氧、磷和铁——这些都是构成行星和生命的物质。
从很多方面来说，那些第一批恒星就是宇宙之母。“我们正在回望创造我们的东西，”宇宙黎明中心的天体物理学家莉斯·克里斯滕森说。
或许恰如其分的是，最近讨论宇宙起源的会议就在赫尔辛格举行，距离启发《哈姆雷特》中艾尔西诺城堡的原型不远。在剧中，莎士比亚的丹麦王子哀叹道：
这片壮丽的苍穹，
这庄严的屋顶，点缀着
金色的火焰——唉，在我看来，
不过是一团污秽、疫病的水汽。
人类是多么了不起的作品，理性多么高贵，
才能多么无穷无尽……
……然而，对我来说，这精粹的尘土又是什么？
尽管这是对存在的悲思——宇宙是“一团污秽、疫病的水汽”，人类是“精粹的尘土”——我们现在明白，哈姆雷特的描述在科学上比莎士比亚所能知道的更准确。我们实际上是由恒星中锻造并作为气体和尘埃喷射到虚空中的元素构成的。
然而，与在艾尔西诺沉沦的哈姆雷特不同，研究宇宙起源的科学家们对这些宇宙开端感到振奋。
编者注：熨斗研究所由西蒙斯基金会资助，该基金会也资助本编辑独立的杂志。西蒙斯基金会的资助决定不影响我们的报道。

英文来源：

Astrophysicists Puzzle Over Webb’s New Universe
Introduction
When Charlotte Mason ponders cosmic mysteries, she likes to doodle. “I am quite a visual person,” she said. “I usually draw a lot of pictures trying to understand what’s going on.”
Mason, an astrophysicist at the Cosmic Dawn Center in Copenhagen, has lately been filling pages with sketches of “little red dots,” perplexing objects discovered by the hundreds in images from the James Webb Space Telescope (JWST). Little red dots were never seen before the telescope came online in 2022. But we now know that they started to appear in significant numbers roughly 650 million years after the Big Bang.
These dots are just one of the thrilling mysteries that have emerged from JWST’s observations of the early universe. Others include black holes that seem impossibly large for their age, as well as ancient galaxies that defy what we thought we knew about the first billion years after the Big Bang. At first, scientists were astounded: The universe revealed by JWST simply didn’t square with our understanding of astrophysics. Now, a wave of new theories offers tantalizing solutions — but which ones portray reality is an open question.
Recent ideas suggest that little red dots could be black holes cocooned in thick gas, possibly representing a completely new type of object called a black hole star, in which the tight shroud of gas emits light like a stellar atmosphere.
“This would be my black hole,” Mason said, drawing a small circle and filling it in. “I might put a disk on it, because we think that’s where some of the emission comes from.” She slashed a line through the circle’s center. “Then the kind of naïve picture is just this dense gas cloud around the black hole.” She drew a larger circle surrounding the object.
But Mason thinks there may be more to these cosmic enigmas. She and colleagues recently analyzed the spectrum of light emitted by one little red dot. If the dense-cloud picture is correct, then some of the light should have been altered from passing through the gas — but that’s not what they saw.
“Now what do I do? Start again. But now if I make my gas clumpy,” Mason said, drawing a new diagram with holes in the clouds surrounding the black hole, “I should be able to get [a signal] that looks closer.”
All around the world, researchers like Mason are eagerly piecing together JWST’s glimpses of the ancient cosmos to create a clearer picture of our universe’s beginnings. And like the photons that travel billions of light-years to reach us, new fragments are constantly falling into place.
The Universe’s Bottomless Pits
The story of black holes has become more complicated thanks to JWST, which keeps spotting ancient black holes that are too big to explain with established theories — much too big.
Shortly after the Big Bang, the universe was largely featureless and smooth. Then, just a few hundred million years later, “we already see billion-sun black holes growing,” said Jenny Greene, an astrophysicist at Princeton University. “In order to get them that big so quickly, you have to do some gymnastics.”
Scientists look at two key factors that influence a black hole’s size: how massive a black hole “seed” was when it originated, and how quickly these seeds grew after that. But it’s hard to explain how black holes either formed already big enough or grew fast enough to reach a billion times the mass of the sun in early cosmic times.
In the modern universe, black holes form when the core of a massive star runs out of fuel and collapses. Considering the first stars were quite massive, they could have left behind black hole seeds of up to about 100 solar masses, Greene said.
“We know that happens, but it’s really, really hard to get them to a billion so quickly,” she said. “You really have to force-feed them.”
Scientists have historically believed there’s a hard limit to how fast black holes can grow. As material falls toward the black hole, it gets hot as it spins around like water going down a drain. The radiation that this “accretion disk” produces pushes back against more stuff flying in, preventing the black hole from consuming more. This intake limit, called the Eddington limit, should make it impossible for black holes to grow tens of millions of times larger in the time available.
But recent computer simulations suggest that black holes might have something of a back door. If the accretion disk puffs up in just the right way, the incoming gas can overwhelm the radiation pressure. Such “super-Eddington” accretion would lead to gas funneling in at extraordinary rates.
Even so, astronomers don’t know if there would have been enough gas around to produce the biggest black holes. Some researchers think that ancient, dense star clusters may have created lots of black hole seeds that rapidly merged.
Or perhaps supermassive black holes never started as stars at all. In this case, colossal clouds of gas would have plunged directly into a black hole. This “direct collapse” mechanism can form a seed some 10,000 times the mass of the sun.
“The problem with the direct-collapse picture is that it requires really Goldilocks conditions,” Greene said. For direct collapse to work, a gargantuan cloud needs to compress into a black hole all at once, without first fracturing into smaller clouds that would form stars. This requires specific gas chemistries, and the cloud must rotate slowly.
“When people try to do this in a computer, they can make these direct-collapse black holes, but they can’t make enough of them to explain all the black holes that we see,” Greene said.
There’s some evidence to support each of these theories. In 2024, JWST saw a black hole from about 1.5 billion years after the Big Bang gobbling up material at about 40 times the Eddington limit. If black holes earlier in cosmic time also stuffed themselves in this way, perhaps the biggest among them started as relatively small seeds.
Recently, however, researchers took a long look at a little red dot from about 750 million years after the Big Bang that is gravitationally lensed by a cluster of galaxies in the foreground. They concluded that the object is a “naked” supermassive black hole, an estimated 50 million times the mass of the sun, without any discernible stars surrounding it. If that mass estimate is correct, the implication is that the black hole may have formed as a large seed, possibly via direct collapse, before any galaxy was present.
“There’s clearly differences in how the black holes are growing that we don’t fully understand yet,” Greene said. “So for me, the most exciting thing to do right now is try to understand, physically, what’s different?”
Building a Galaxy
Like early black holes that seem too big, many early galaxies spotted by JWST seem too bright. To figure out why, researchers are reassessing their ideas about how galaxies form.
Some 200 million years after the Big Bang, the infant universe was small, dense, and hot compared to today. As it expanded and cooled, dark matter coalesced in great clumps that scientists call halos. The gravity of these lightless halos pulled hydrogen and helium gas into vast filaments that gathered in the cores of the enveloping dark orbs. Once enough gas had accumulated, extreme pressures sparked the fires of nuclear fusion and ignited the first stars, which were drawn together to make the first galaxies.
Astronomers generally describe the timing of these events in terms of redshift, or how much the light from early objects has been stretched by cosmic expansion.
“Not too much happens until about a redshift of 15 [270 million years after the Big Bang], and then lots of gas starts pouring in along these filaments,” said Rachel Somerville, a senior research scientist who studies galaxy formation at the Flatiron Institute in New York. She was presenting new computer simulations at a meeting in April 2026 in Helsingør, Denmark. In a conference room overlooking a strait between the Baltic and North seas, more than 100 researchers from around the world had gathered to discuss the puzzles of the universe’s infancy. Colorful visualizations of dark matter, gas, and starlight danced on a projector screen.
“By about a redshift of 11 [420 million years], the star formation rate starts to really pick up,” she continued. “At redshift nine [550 million years], we make a nice galaxy.”
The galaxy on the screen represented an early population, but the most ancient galaxy discovered by JWST so far existed only 280 million years after the Big Bang. The telescope’s bewildering discovery of bright, early galaxies initially led some scientists to suggest that our understanding of fundamental cosmology, the laws that govern the behavior of energy and matter in the early universe, may be flawed. But after a few years of studying these primitive objects, theorists now have several models to explain their brightness and abundance.
“We almost have gone from having too many early galaxies to having too many theories to explain them,” Somerville told the room.
Perhaps the first galaxies converted gas to stars more efficiently than previously thought. Or they experienced periodic bursts of star formation driven by turbulent conditions. Or maybe early star-forming regions preferentially created massive, extremely bright stars. Many astrophysicists think some combination of these factors, and perhaps others, contributed to the galaxies’ development.
To test these new ideas, researchers are exploring the infant universe through simulations. “There’s actually been really remarkable progress since Webb launched, really in the last year or so, on numerical simulations,” Somerville told attendees, adding that these new simulations “perhaps are more appropriate and more informative for interpreting observations in the high-redshift universe.”
As these models improve, JWST is documenting more and more galaxies. By comparing what it sees in the early universe to simulations that attempt to explain why, researchers are inching closer to uncovering the true nature of cosmic dawn.
“We can try to match the best analogue of the observed galaxy to the simulated,” said Hakim Atek, an astrophysicist with the Paris Institute of Astrophysics at Sorbonne University. “Once you have this best match, you can look at the star formation history, because in the simulations you have access to the whole history of the galaxy.”
An intriguing clue has recently emerged from JWST’s Mid-Infrared Instrument (MIRI), a supercooled device that can split apart the light of distant objects. MIRI has revealed that early galaxies do not have the same traits, as scientists assumed.
“The main surprise is the diversity of the properties of galaxies we are seeing at early epochs,” Atek said. “You’re expecting that they would look the same.”
This diversity may be an indication of star formation that occurred in bursts, as galaxies cycled through periods of fusing stars that exploded and expelled gas clouds, halting the creation of stars, only for the gas to gather again and trigger a new wave of stellar birth.
“Some of them, it looks like they cleared all the interstellar medium that is present there, the gas and the dust. It’s like you’re looking only at naked stars,” Atek said. “Another galaxy is the opposite. It has a lot of gas.”
A further clue comes from a group of galaxies with an overabundance of nitrogen. The presence of the element suggests that there may have been a lot of particularly massive stars in the early universe. In simulations, these massive stars generate an excess of nitrogen before exploding in supernovas and scattering the element across their host galaxies.
Someday, researchers may uncover the full picture of galactic formation. Until then, they’ll continue sifting through the traces in new observations and simulations.
The Puzzle of Existence
Once the astral lights switched on, the universe transformed. Radiation from early galaxies and black holes ionized a sea of neutral hydrogen gas, carving out immense bubbles amid the cosmic haze. Researchers call this period reionization, as it was the second time the universe was ionized. It marks the end of the cosmic dark age, when the foggy abyss was devoid of stars.
The first stars, thought to be hundreds or thousands of times more massive than the sun, furiously worked their way through their hydrogen and helium fuel and erupted in powerful supernovas, seeding the universe with new elements such as carbon, nitrogen, oxygen, phosphorus, and iron — the stuff of planets and of life.
In many ways, those first stars are the mothers of the universe. “We’re looking back at what created us,” said Lise Christensen, an astrophysicist with the Cosmic Dawn Center.
Fitting, perhaps, that the recent conference to discuss cosmic origins took place in Helsingør, down the road from the castle that inspired Elsinore in Hamlet. In the play, Shakespeare’s Danish prince laments:
this brave o’erhanging
firmament, this majestical roof, fretted
with golden fire — why, it appeareth nothing to me
but a foul and pestilent congregation of vapors.
What a piece of work is a man, how noble in
reason, how infinite in faculties
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
yet, to me, what is this quintessence of dust?
Though it’s a mournful rumination on existence — the universe as “a foul and pestilent congregation of vapors,” humanity as the “quintessence of dust” — we now understand that Hamlet’s description is more scientifically accurate than Shakespeare could have known. We are in fact made of elements forged in stars and ejected into the void as gas and dust.
Unlike Hamlet wallowing in Elsinore, however, scientists who study the origins of the universe are exhilarated by these cosmic beginnings.
Editor’s note: The Flatiron Institute is funded by the Simons Foundation, which also funds this editorially independent magazine. Simons Foundation funding decisions have no influence on our coverage.