Question

Two astronauts are repairing the arm of a space station together during a spacewalk. Can they talk to each other and hear the sounds of metal clanking as they do on the Earth?

Answer 1

No. Outer space is nearly a vacuum, and sound requires a material medium to propagate. Since there is no air to carry sound vibrations, astronauts cannot hear each other speak or hear metal clanking directly; they communicate using radio devices fitted in their spacesuits.