Muzvinyorwa zveGeneral Relativity, hapana chinhu chemuviri chinogona kubata kana kukunda chiedza. Hapana chinobva pachiitiko A chinogona kusvika kune imwe nzvimbo X pamberi pechiedza chakatumirwa paA kuenda kuX. Nekuda kweizvozvo, kuongororwa kwemitsetse yese yechiedza (null geodesics) kunopa ruzivo rwakakosha nezve chimiro chenguva yenguva. Chimiro ichi chinogona kuratidzwa uchishandisa Penrose <unk> Carter madhayagiramu umo nzvimbo dzisingaverengeke uye nguva dzisingaverengeke dzakapfupikiswa ("compactified") kuitira kuti dzikwane pamepu yakapera, nepo mwenje uchiri kufamba pamwe ne diagonals senge mune yakajairwa nzvimbo-nguva madhayagiramu. Kuziva kukosha kwechimiro checausal, Roger Penrose nevamwe vakagadzira izvo zvinozivikanwa seGlobal geometry. MuGlobal geometry, chidzidzo chechinhu hachisi chimwe (kana imwe) yemhuri yeEinstein's equations mhinduro.
A kusvika kuX