Can we hear in space?« Back to Questions List

You know that sound needs a medium to travel. The speed of a sound wave depends upon the medium through which it travels. In general, sound travels faster through solids than through liquids or gases. Before we see if we can hear in space, let us first discuss about the objects found in space. Space contains stars, planets, comets, moons  asteroids and few other cosmic bodies. You might have learned that space is a vacuum. So how can space contain all these massive bodies and still be a vacuum?

It's because space is big. Between these large objects are millions of miles of emptiness. This empty space called interstellar space is practically devoid of all matter, so it's effectively a vacuum. Now, sound waves need a medium to travel. As there's almost no matter in interstellar space, sound can't travel through it.

space sound

So how do astronauts outside their space shuttle talk to each other? It is because of the space suit that contains a radio unit. Radio waves are electromagnetic waves that can travel through vacuum. Radio unit transmits and receives signal, converts it into sound which will travel through the air in the space suit.

 

More from attemptNwin.com, the complete site for children

How does a ballpoint pen work?

Why do some newspapers turn yellow over time?

Why don’t currency notes disintegrate when it get washed?

What are the important components of our immune system?

What is global warming?

Posted by attemptnwin
Asked on January 21, 2014 3:34 pm