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Almost every element in the universe,热门新闻 including the elements that make up the human body, is produced by supernova, the earliest star explosion process. According to a report on the website of New Scientist on the 28th, in a new study, scientists at the University of Cambridge in the UK may have detected the earliest signs of supernovae with the help of the james webb Space Telescope. This discovery helps to reveal the origin of the universe, and related papers have been submitted to the preprint website.
GLASS-z12 galaxy shows the earliest signs of supernovae in the universe.
Image source: NASA official website
When stars formed after BIGBANG, most of them only contained hydrogen and helium. When these first-generation stars, known as group III stars, die, they explode in supernovae, producing heavier elements, which will be "pocketed" by the new generation of stars.
Astronomers can't directly observe these ancient stars or their explosions, because they may be born and died hundreds of millions of years after BIGBANG. In the latest research, the research team used the Webb Space Telescope to study one of the earliest known galaxies, GLASS-z12. GLASS-z12 was born 350 million years after the Big Bang, and Webb Space Telescope "saw" it last year. By analyzing the light emitted by GLASS-z12, the team found that it contains elements such as carbon, rare oxygen and neon, which is the farthest symbol of heavy elements in the universe.
The research team focuses on the ratio of carbon to oxygen in the galaxy because it can reveal the star process that is taking place. The ratio of carbon to hydrogen in ancient galaxies tends to decrease, because stars rarely explode repeatedly and "pollute" galaxies with these heavier elements, but the ratio of carbon to oxygen in GLASS-z12 is higher than that in many younger galaxies.
At present, it is not clear what makes the carbon in the galaxy. One possible explanation is the exploding Star Group III, which is a very low-energy and pure star, enabling them to produce more carbon than other stars. If the above explanation is correct, the observation results will allow scientists to better understand the star process that produces all the elements even if the group III stars are not directly seen.