Why Voyager 1 Still Hasn't Hit a Single Thing After 49 Year

Script written by Nathan Clarke Voyager 1 has been travelling for 49 years without stopping. It crossed the entire solar system, passed through the asteroid belt, punched through the heliopause, and is now in interstellar space more than 24 billion kilometres from home. And there is a question people keep asking: how has it gone half a century without crashing into anything? The answer is that it has crashed into things. Constantly. It is being hit right now, while you read this. Voyager's instruments register between three and seven impacts every hour. They have been recording them for decades. Millions of collisions across the mission. The remarkable thing is not that it has avoided being hit — it is that not one of those impacts has mattered in the slightest. In this video we break down why. Why the asteroid belt is nothing like the movies show it, and why every probe we have ever sent has crossed it without dodging a single rock. How Voyager accidentally became a dust detector when engineers discovered that its plasma wave instrument registers a voltage spike every time a particle strikes the spacecraft. What has actually been hitting it — interstellar dust grains between 0.1 and 10 micrometres across, smaller than the width of a human hair, with masses ten billion times lighter than a single grain of beach sand. And then the part that matters for the future. Impact energy scales with the square of velocity. Voyager moves at 61,000 kilometres per hour, so those particles are harmless. But Breakthrough Starshot proposes craft at twenty percent of the speed of light — where the exact same dust becomes projectiles capable of punching through any lightweight shielding. It is one of the most serious unsolved problems in interstellar travel, and a 1970s instrument measuring something it was never built to measure is our primary data source on it. Voyager will keep travelling for millions of years after it stops transmitting. Estimates suggest it could remain essentially intact for hundreds of millions of years. It will outlast the pyramids. It will probably outlast our species. Subscribe for weekly space documentaries. Sources: NASA — Voyager 1 Mission: https://science.nasa.gov/mission/voyager/voyager-1/ NASA NTRS — Micron-Sized Dust Particles Detected by Voyager Plasma Wave Instruments: https://ntrs.nasa.gov/citations/19980018164 Cornell / Nature Astronomy — Voyager 1 detects interstellar plasma hum: https://www.as.cornell.edu/news/emptiness-space-voyager-1-detects-plasma-hum NASA — Asteroids: https://science.nasa.gov/solar-system/asteroids/ 0:00 Voyager's Half-Century Journey 0:57 Debunking the Asteroid Belt 2:38 The Invisible Dust Storm 5:59 The Physics of Absolute Emptiness 7:10 The Challenge of Interstellar Speed #Voyager1 #InterstellarSpace #NASA #SpaceDocumentary #Astronomy #DeepSpace #SpaceFacts