October 20, 2026
Although about 13.8 billion years have passed since the creation of the universe, the first moments of its launch are still surrounded by widespread mystery, with scientists continuing to question the nature of matter and antimatter, the mechanism of the formation of the first stars, and the future fate of the universe. In the absence of the ability to directly observe these founding moments, researchers resort to particle physics experiments to reproduce conditions similar to the environment of the early universe.
In this context, a report published by BBC Sky at Night Magazine reviewed the visions of astrophysicist Dan Hopper, head of the theoretical astrophysics group at the US Fermi National Laboratory and professor of astronomy and astrophysics at the University of Chicago, highlighting the latest scientific assumptions and theories related to the beginnings of the universe and its development.
Hooper explained that the biggest challenge lies in scientists seeking to explore the depths of the first seconds and parts of a second that followed the Big Bang, as there are no direct observations. To compensate, particle accelerators are used to simulate the extreme temperatures of the early universe, while astronomical observations track later stages.
Regarding the chronology of cosmic evolution, estimates indicate that the “cosmic dawn” witnessed the appearance of the first stars about 200 million years after the Big Bang, characterized by extreme massiveness and temperature, and a high rate of evolution. In contrast, it took about an additional nine billion years for the Sun and the planets of the solar system to form. As for what came before the Big Bang, the traditional perception indicates that time and space arose with the creation of the universe, which makes talking about what preceded it outside the scope of the usual concept of time, with Hopper acknowledging that current knowledge remains incomplete and subject to change as research progresses.
“The mystery of matter and antimatter” stands out as one of the most important challenges facing physicists. Theories indicate that equal quantities of them arose at the beginning of the universe, where each particle annihilates its counterpart when they meet to turn into energy. The question remains about why the matter from which planets, stars, and living organisms were formed remains without being completely annihilated with antimatter.
In terms of future prospects, Hopper is counting on the experiments of the next decade to deepen scientific understanding, hoping to measure the light emitted about 380 thousand years after the Big Bang at the time of the formation of the first atoms, which will pave the way for a better understanding of the stage of “cosmic inflation” and the vast and early expansion of space. Scientists are also looking forward to launching satellites to monitor gravitational waves resulting from the explosion, and developing techniques to directly detect neutrinos formed in the first second of the universe.
As for the fate of the universe, current expectations suggest that expansion will continue indefinitely, causing a gradual decrease in density and temperature until a state of coldness and complete vacuum with the exhaustion of usable energy, emphasizing that these scenarios remain dependent on current scientific knowledge and are not finally settled.
