Ago the great explosionThe universe is expanding: we say it is expanding. But on top of that, this expansion is accelerating! A phenomenon discovered in 1998 by international teams of scientists while studying the evolution of this expansion of star explosions. By looking at the light emitted by other distant types, called supernovae, the team observed the acceleration of this expansion. To explain this result, it was then concluded that the cause was a mysterious form of energy: dark energy, also called dark energy.
Currently untraceable, it has been haunted for decades. Some models assume that it will not exist, and that it will be cosmic equations Who must see it again! A new study was published in Astrophysical Journal I also looked at dark energy, but this time in another aspect: the accurate assessment of the proportion it occupies in the universe. Their analysis is called pantheon +, It corresponds to the improvement of pre-existing methods but with more data this time and a better methodology, thus reducing uncertainty with the outcome “17 times more restrictive than previous evaluations in 1998”, Explains to Futura Dillon Pruitt, first author of the study, and researcher at Harvard and Smithsonian Center for Astrophysics.
Only a third of the matter in the universe
For this purpose, researchers used Type Ia supernovae, which are called thermonuclear supernovae. It corresponds to the explosion of already dead stars – white dwarfs – that are in a binary system. When a low-mass star, less than 10 solar masses, exhausts its fuel, it shrinks and turns into white dwarf. If it is in a binary system, so with another star, it gradually absorbs into …
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