Spacewalk in progress. Watch astronauts @astro_josh (suit with red stripes) and Frank Rubio (unmarked suit) install new @Space_Station rollout solar arrays. The spacewalk is expected to last seven hours.

@NASA @astro_josh @Space_Station Other than communications with the ISS, each other, or NASA, what do the astronauts hear while they're on a spacewalk? Is it complete silence, an electrical hum of some type, the sounds of breathing, classical music...?

@EllenGarnett1 That's about it! Astronauts only hear each other and team members on the ground.