On the centre of the Milky Approach, stars look youthful than they need to
NASA, Caltech, Susan Stolovy (SSC, Caltech)
Stars near the centre of our galaxy could also be practically immortal as a result of they gobble up darkish matter for power.
Greater than twenty years in the past, astronomers observed one thing odd in regards to the stars close to the centre of the Milky Approach. First, the sunshine they emit suggests they’re youthful than anticipated based mostly on their mass, an issue dubbed the “paradox of youth”. Second, older stars are unusually scarce on this area, a difficulty known as the “conundrum of outdated age”.
Now Isabelle John at Stockholm College in Sweden and her colleagues have used a pc simulation to indicate that darkish matter might assist resolve each puzzles.
The galactic centre is understood to be exceptionally dense with darkish matter, so the researchers simulated what occurs when a darkish matter particle hits a star. They discovered that every such particle loses power and turns into trapped inside the star when it collides with the nuclei of the star’s atoms. If different darkish matter particles are already caught in the identical place, they find yourself annihilating one another, and each annihilation produces a burst of power that makes the star brighter.
The explanation stars age is that they run out of gasoline for nuclear fusion, however darkish matter may very well be a further power supply that extends a star’s life. In truth, there’s a lot darkish matter close to the galactic centre that this course of may successfully make stars immortal, says John.
She says her crew’s simulations depend on quite common assumptions about darkish matter and qualitatively match previous observations. However real-world information may go additional. Accumulating extra telescope information and factoring in new findings about darkish matter, which is poorly understood, may assist pinpoint which stars within the Milky Approach’s centre would possibly truly be capable to dwell without end.
Marc Pinsonneault on the Ohio State College says that it’s also essential to think about what the simulations imply for stars which might be additional away from the galactic centre. We’ve very detailed observational information about stars nearer to Earth, so any predicted results of darkish matter needs to be checked in opposition to this information as properly, he says.
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