Question

by which medium light travel in space​

Answer 1

$\large\tt\underline{\green{Answer :-}}$

Light can travel in a vacuum.

$\large\tt\underline{\green{More :-}}$

There are no molecules of air or anything else in a vacuum. Like all forms of electromagnetic waves, light can travel through empty space, as well as through matter.

$\sf\boxed{\bold{\pink{Hope\:It\:Helps :-}}}$

Answer 2

Answer:

light travels in space, through vacuum as there is no air in spcae.