Question

when astronauts work in space, they are sometimes attached to the spacecraft by a line called an umbilical. Why do you think the line has been given this name?

Answer 1

Because it is like the umbilical cord on a baby to its mother this is why they call it umbilical

Answer 2

Probably for the umbilical cord that connects babies (from their early stages in the womb to their removal) to their mothers. The cord is cut, forming the belly button. This is analogous to astronauts in space.