<Li> Wormhole <Ul> <Li> Ellis wormhole </Li> </Ul> </Li> <Ul> <Li> Ellis wormhole </Li> </Ul> <Tr> <Td> <Ul> <Li> Equations </Li> <Li> Formalisms </Li> </Ul> (show) <Table> <Tr> <Th> Equations </Th> </Tr> <Tr> <Td> <Ul> <Li> Linearized gravity </Li> <Li> Einstein field equations </Li> <Li> Friedmann </Li> <Li> Geodesics </Li> <Li> Mathisson--Papapetrou--Dixon </Li> <Li> Hamilton--Jacobi--Einstein </Li> </Ul> </Td> </Tr> <Tr> <Th> Formalisms </Th> </Tr> <Tr> <Td> <Ul> <Li> ADM </Li> <Li> BSSN </Li> <Li> Post-Newtonian </Li> </Ul> </Td> </Tr> <Tr> <Th> Advanced theory </Th> </Tr> <Tr> <Td> <Ul> <Li> Kaluza--Klein theory </Li> <Li> Quantum gravity </Li> </Ul> </Td> </Tr> </Table> </Td> </Tr> <Ul> <Li> Equations </Li> <Li> Formalisms </Li> </Ul>

What type of black hole might you be able to approach the event horizon