此外，许多早期星系的亮度也远超预期。科学家正透过电脑模拟来重新评估星系的形成机制，提出如气体转化为恒星的效率更高、周期性爆发的恒星形成，或是早期更倾向于产生超大质量恒星等理论，以解释这些星系的亮度和丰富度。
这些早期恒星和黑洞的辐射引发了宇宙的再电离，结束了黑暗时代。第一代恒星在演化末期爆发为超新星，向宇宙散播了碳、氮、氧等生命元素。研究这些宇宙起源不仅能揭示宇宙的演化，也能让我们理解人类自身化学元素的来源。
The James Webb Space Telescope (JWST) has observed early black holes and galaxies that are far larger than expected, as well as perplexing "little red dots" never seen before. These discoveries challenge existing astrophysical theories, prompting scientists to propose new models to explain how these black holes grew so rapidly in the early universe.
In addition, many early galaxies appear much brighter than anticipated. Scientists are using computer simulations to reassess galaxy formation mechanisms, proposing theories such as more efficient conversion of gas to stars, episodic bursts of star formation, or a preference for forming extremely massive stars in the early cosmic era.
The radiation from these early stars and black holes initiated cosmic reionization, ending the cosmic dark ages. The first stars eventually erupted as supernovas, seeding the universe with essential elements for life like carbon, nitrogen, and oxygen, showing that we are ultimately made of elements forged in the stars.