What is a gravas­tar?

At the turn of the mil­len­nium an equally in­vis­i­ble, but po­ten­tially dis­tin­guish­able al­ter­ative to black holes was pro­posed

All About Space - - Gravastars -

A sur­face you would no­tice While you would fall into a black hole, a gravas­tar’s vac­uum in­te­rior is wrapped in­side a shell of quan­tum mat­ter which you would def­i­nitely feel upon im­pact.

A black star

The strength of a gravas­tar’s grav­i­ta­tional field means no light com­ing from them would ever reach us.

Freed from the sin­gu­lar­ity Un­like clas­si­cal black holes gravas­tars don’t con­tain a sin­gu­lar­ity, a point of in­fi­nite den­sity that breaks our cur­rent laws of physics.

Mak­ing waves Sup­port­ers of the the­ory be­lieve the merger of two gravas­tars could also have pro­duced the grav­i­ta­tional waves recorded by LIGO.

A pre­dic­tion 100 years in the mak­ing In 2015 Emil Mot­tola showed that much of the ground­work for his gravas­tar the­ory had been pro­posed 100 years ear­lier by physi­cist and as­tronomer Karl Sch­warzschild.

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