Can light travel thought a vacuum why or why not?

Answer 1

Light can travel through a "vacuum" because the vacuum has a medium to transport light.

Light can travel through a vacuum due to its dual nature; it can exhibit behaviours of either particles or waves, depending on the conditions under which it is observed, a situation called "particle/wave duality". A wave would need a medium to propagate (move) through, but a particle is like a tiny bullet, and can move independently (though still affected by) of the medium. In the case of a vacuum (by definition a space containing no matter), light behaves like a particle (called a photon), and moves through it in a straight line, unaffected. If, in that vacuum, it encounters something else, say a diffraction grating, its wave nature appears and it diffracts (spreads out), exactly as a wave would, but a particle would not.

Answer 2

Yes, light can travel through a vacuum because it is an electromagnetic wave and does not require a medium to propagate. This is why we can see the light from the sun and stars even though space is a vacuum.