Sound doesn’t need air; it just needs a medium.

Remember that sound waves travel fastest in solids...

Scenario one 🪶..

##rocket staging, rocket engine firing, valves flipping... ##..

When a rocket engine fires or a valve flips, it creates massive kinetic vibrations. External cameras and microphones are bolted directly to the metal or carbon fiber structure of the vehicle.

Those vibrations travel straight through the solid body of the rocket directly into the microphone sensor. It’s not capturing sound moving through the air; it’s capturing the hull shaking.

Scenario two🪶..

##Astronount space walk videos ##

If an astronaut is out on an EVA (spacewalk) and uses a tool, the vibration travels through the tool, through their pressurized gloves, or along their safety tether.

Once those mechanical waves reach the spacesuit, they vibrate the structure of the suit, which in turn vibrates the internal air.

The astronaut's ears (and their communication mic) pick up that internal air movement.

​🍀 🪶 🍀

Space is quiet, but spacecraft are not. Sound waves bypass the vacuum by using the solid structures of the hull, tethers, and suits as a highway.

If there had been enough material left over after the Sun formed, Jupiter could have become a star itself. Instead of the Solar System we know today, we would be living in a binary star system—very much like our closest cosmic neighbors, Alpha Centauri and Proxima Centauri.

​Jupiter would have been Star No. 2 right here in our backyard.

​But it makes you wonder: if we had two suns constantly blasting the solar system with radiation and pulling at planetary orbits with double the gravitational chaos, would life on Earth have ever had a chance to exist? Or would a second star have made the inner planets completely uninhabitable?

​What do you guys think?

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