The earth's atmosphere extends to a height of nearby 200KM above its surface there many be explosion and noises taking place in the outer space but we do not hear them.why?
It's because it needs a medium to travel
And it can travel through liquid,solid and gases
But not through vaccum
Sound is propagated through the atmosphere by the motion of air molecules. No air, no sound.
We do not hear any explosions or noises that may occur in outer space because sound requires a medium, such as air or water, to propagate. In space, there is a vacuum, which means it is devoid of air or any other medium. Without a medium to vibrate and transmit sound waves, sound cannot travel through space.
To understand why sound needs a medium, let's break down how sound works. Sound is created when an object vibrates, causing compressions and rarefactions in the surrounding medium. These compressions and rarefactions create waves that travel through the medium and reach our ears, allowing us to perceive the sound.
On Earth, where we have an atmosphere, sound waves can travel through the air, water, or other substances. However, as we move away from the Earth's surface, the density of the atmosphere decreases significantly. At around 200 kilometers above the surface, known as the Kármán line, the atmosphere becomes extremely thin, eventually transitioning into the vacuum of space.
In space, the absence of air or any other medium means there is nothing for the sound waves to travel through and reach our ears. Therefore, even though there may be explosions or other loud events occurring in space, we cannot hear them.
It is worth noting that while sound cannot travel through the vacuum of space, there are other forms of waves, such as electromagnetic waves (including light), that can propagate through space.