Sound travels through the vibration of atoms and molecules in a medium (such as air or water). In space, where there is no air, sound has no way to travel.
Sound does not travel at all in space. The vacuum of outer space has essentially zero air. Because sound is just vibrating air, space has no air to vibrate and therefore no sound.
While wearing the current space suits, astronauts wear a Communications Carrier Assembly (CCA), or "Snoopy Cap" — a fabric hat fitted with microphones in the ear area for listening and boom microphones in front of the mouth for speaking. These caps are worn under the helmet and visor that surround an astronaut's head.
This is because there is no air in space – it is a vacuum. Sound waves cannot travel through a vacuum.
As there is vacuum, it means there are no molecules or particulate matter between them for the sound to travel. So they cannot talk to each other.
Sound waves need a medium to travel. As there is no atmosphere or medium on the moon, that's why no sound can be heard on the moon. Astronauts use radio waves while talking to one another on the surface of the moon.
The moon does not have atmosphere. Since there is no medium which is necessary for generation and propagation of sound, between the astronauts, direct sound propagation between them is not possible.
We can't smell space directly, because our noses don't work in a vacuum. But astronauts aboard the ISS have reported that they notice a metallic aroma – like the smell of welding fumes – on the surface of their spacesuits once the airlock has re-pressurised.
Outer space is not completely empty; it is a near-perfect vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium, as well as electromagnetic radiation, magnetic fields, neutrinos, dust, and cosmic rays.
In fact, it doesn't actually have a temperature at all. Temperature is a measurement of the speed at which particles are moving, and heat is how much energy the particles of an object have. So in a truly empty region space, there would be no particles and radiation, meaning there's also no temperature.
Sound is a mecanical wave, which means that it needs substance to travel through, such as air or water. In space, there is no air, so sound has nothing to travel through. If someone were to scream in space, the sound wouldn't even leave their mouths.
The loudest sound in the universe definitely comes from black hole mergers. In this case the “sound” comes out in gravitational waves and not ordinary sound waves.
But what of the average temperature of space away from the Earth? Believe it or not, astronomers actually know this value quite well: an extreme -270.42 degrees (2.73 degrees above absolute zero).
Astronauts can't cry the same in space as they do on Earth.
Your eyes make tears but they stick as a liquid ball. In fact, they sting a bit. So — space tears don't shed." Unless an astronaut wipes that water away, tears in space can form a giant clump that can break free of your eye, as The Atlantic explained.
During the Mars-500 experiment, six astronaut crews stayed in an isolated space and lived as if they were on Mars for 520 days. Cosmic radiation and microgravity were not replicated in the experiment, so the slower aging process found by scientists is caused by social isolation and other relative effects.
When astronauts are out in space, they can whistle, talk, or even yell inside their own spacesuit, but the other astronauts would not hear the noise. In fact, the middle of space is very quiet. Sound travels in waves, and it moves at different speeds through air or water or other materials.
Our atmosphere is extended up to an imaginary line called the Kármán Line. The astronomers consider this line to be 100 km above sea level. It is a convention that we have agreed to follow that outer space begins from this line.
Our universe began with an explosion of space itself - the Big Bang. Starting from extremely high density and temperature, space expanded, the universe cooled, and the simplest elements formed. Gravity gradually drew matter together to form the first stars and the first galaxies.
As it stands, the universe is the largest object that we are aware of. There is nothing larger, and everything we can smell, hear, taste, touch, or see is a part of it.
Smoke detectors work by looking for particles in the air that are about the same size as the particles normally found in smoke. However, a 1996 NASA Glenn study showed that smoke particles in space are bigger than those on Earth.
The sky appears dark instead of blue to an astronaut because there is no atmosphere in the outer space that can scatter the sunlight. As the sunlight is not scattered, no scattered light reach the eyes of the astronauts and the sky appears black to them. Q. What colour does the Sun appear to Astronauts in Space?
Highlights. While sound waves cannot travel through the vacuum of space, NASA says that space can be extremely noisy under right conditions In what sounds like a soundtrack for an eerie movie, NASA recently Tweeted an audio clip that represents sound in space.
Sound requires a medium for propagation. Therefore, two astronauts floating close to each other in space will not be able to talk to each other without using any special device because in space there is vacuum ( no material medium).
For life to exist, water is very essential. However, there is no water as well as no atmosphere on the Moon. Hence, life cannot exist on Moon.
On the moon there is no atmosphere, which means there is no medium present. Since sound needs a medium for its propagation it cannot travel. So when two persons on the surface of the moon talk to each other they cannot talk to each other.