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There may be an invisible cosmos of stars , nebula and galaxy made up entirely ofdark matter . And astronomers now get it on how to look for it .
To put it simply , dark subject is a mystery . Astronomers have dozens of self-governing piece of evidence that all point to the cosmos of some build of matter in the world that is effectively inconspicuous . It does n’t interact with light . But it does exert a gravitative influence on normal matter . dour matter keeps galaxies glued together despite their high spin rates , observe cluster gas cohesive despite its high temperature , bends the itinerary of background light all over the population , and evenshapes the largest structure in the cosmea .
This composite image shows the distribution of dark matter, galaxies, and hot gas in the core of the merging galaxy cluster Abell 520, formed from a violent collision of massive galaxy clusters.
Despite evidence for its existence , the identicalness of dark matter particles stay unknown . For X , cosmologist assumed there was just one variety of dark subject particle , a unmarried metal money that dominates the world . But recently they have begun to wonder if sinister thing might be as rich and varied as the normal universe . For object lesson , some possibility of high - energy physics forecast the existence of a duplicate , or mirror , to every normal matter particle survive in the dark sector . In this vision of the cosmos , there would be morose electrons , dark quark , dark neutrinos , and so on , all interacting with each other through their own readiness of cardinal force , entirely exotic from the forces we live .
This mirror universe would be everywhere , but completely invisible to us . So how can we prove this mind ? This was exactly the question beat by a team of astronomers in a paper , which has not yet been peer reviewed , publish Nov. 29 to the preprint databasearXiv . They encounter that , astonishingly , mirror stars might make themselves visible , and they would calculate very different than anything else we ’ve ever found in the universe .
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Mirror principal would shape as different species of dark matter interact , fall behind energy , and clump together . This would unfold in a mental process correspondent to the organisation of ordinary stars , where H and helium gravitationally collapse , release energy through the emission of photon , and become dense enough to form stars . These mirror wizard , however , would interact through their own force of nature , and would pass off radiation — although it would be through the passing ofdark photons , which would be invisible to us .
There could be trillion , even trillion of these dark star topology float throughout theMilky Waygalaxy alone , given that dark topic account for roughly 80 % of the mass of every galaxy .
But crucially , as the writer realize , these mirror stars still havegravity . That ’s how we know that dark matter be in the first place . And any monolithic , relatively compact object , whether a regular star or a mirror star , will gravitationally appeal matter around it . So these mirror star will pull on gas and dust float in the interstellar medium .
That veritable issue will itself clump up into what the authors call " nugget . " As the nugget collapse they will heat up and emit radiation . That actinotherapy will see like it comes from a normal wizard , but not a type of star astronomers have describe . Instead the nuggets will be very red , because they do n’t have the gamey temperature of their normal leading siblings , and very dim , because the nugget are not very large .
— Our entire coltsfoot is warping , and a mammoth blob of dark matter could be to blame
— Dark matter could be building up inside dead stars — with potentially volatile consequences
— James Webb telescope reveals 3 potential ' dark stars ' — coltsfoot - sized object power by unseeable dark issue
But there are other small , shadowy objects in the universe , such as white dwarfs andplanetary nebulas . The authors discovered that they can tell these nuggets from livid dwarf based on the wavelengths of electromagnetic radiation they emit . If we see what look like a dull white dwarf but it has the wrong spectrum , it just might be a nugget of normal matter sit in the heart of a mirror star . Also , these nugget will give out light in wavelengths not found in typical planetary nebulas .
While the approximation of a mirror world is very hypothetical , it is a realtestable , scientific estimation , the discipline shows . If mirror stars are out there , there just might be nuggets in their warmness , and with sensitive and large enough sketch we just might find them .
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