What is the best ev­i­dence we have for black holes?

All About Space - - Ask Space -

For 20 years as­tronomers have stud­ied the de­tailed mo­tions of 100 in­di­vid­ual stars at the cen­tre of our galaxy around a mys­te­ri­ously empty re­gion known as Sagit­tar­ius A*. these or­bits im­ply that there is a huge source of mass of over 4 mil­lion Suns cramped into a re­gion not much big­ger than our So­lar Sys­tem… [Here we] see no ex­tra light, cer­tainly noth­ing close to a mil­lion Suns' worth. they rep­re­sent a piv­otal turn­ing point in our un­der­stand­ing of na­ture: they are re­gions of space where time it­self comes to an end. they form as an in­escapable con­se­quence of ein­stein’s gen­eral the­ory of rel­a­tiv­ity, and their dis­cov­ery and con­fir­ma­tion rep­re­sent a huge suc­cess for physics. [the] most im­por­tant as­pect of black holes is that they go be­yond even rel­a­tiv­ity – they pre­dict a re­gion of in­fi­nite den­sity and pres­sure, the sin­gu­lar­ity, where the laws of physics will cease to ex­ist. to­day physi­cists in­ter­pret this as a sign that the the­ory of rel­a­tiv­ity is in­com­plete.

Black holes are dif­fi­cult to de­tect be­cause of their very na­ture

Dr Asa Bluck is an as­tronomer at the Univer­sity of Vic­to­ria, Canada

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