Wiki.PKP.in

Interesting question!!

The absence of a material medium (the vacuum of empty space) can also be thought of as a transmission medium for electromagnetic waves such as light and radio waves.It is now known that electromagnetic waves do not require a physical transmission medium, and so can travel through the "vacuum" of free space.

But ஒண்ணு தெரியுமோ Contrary to popular understanding, outer space is not completely empty (i.e. a perfect vacuum,) but contains a low density of particles, predominantly hydrogen plasma, as well as electromagnetic radiation. Hypothetically, it also contains dark matter and dark energy.

எனக்கு பிடித்தமான படம் ஒன்று இங்கே