What If Everyone JUMPED At Once
Hey, Vsauce. Michael here. And what if everysingle person on Earth jumped at the exact same timeé Could it cause an earthquake orwould we not even be able to tellé Well, first things first,let's talk about the Earth's rotation. The Earth spins, that's why we have nightand day, and it spins quickly. At the equator, the Earth is spinning at more than 1,000 MPH. Now, a spinning ice skater can speed up bymoving mass closer to the center and the Earth is no different. In fact, if you getdown on the ground right now and move your mass closer to Earth's center, technically,you will speed up Earth's rotation, making
this day shorter. Now, the change that you would make to theEarth's rotation is way smaller than we could even measure, but it is calculable, and theimpact can be quite impressive when you talk about redistributing more mass than just one person. For instance, last year, the earthquake inJapan redistributed so much of Earth's mass towards the center, that every day since thenhas been 1.8 microseconds shorter. But that was a giant geological event. Whatcan us humans do to the Earth all on our owné I mean, there are more than 7 billion of usnow. What if we all got together in one place
and jumpedé Well, what would that even look likeé Interestingly, if you took the entire humanpopulation of Earth and had them all live in one place with the same density that peoplelive in in New York City, you could fit everyone all of us into the state of Texas. But that's living, not standing around ina crowd, which is how we would probably want to do the jump. If every single person alive right now onEarth stood shoulder to shoulder, you could
fit all of us into the city of Los Angeles.It would be an incredible sight to behold a mere 500 square miles containingevery single person on Earth. Ok, so, then we jump. What happensé Unfortunately, not much. I mean, we're allawesome people here on Earth, but our collective mass compared to the mass of the entire EarthéIt's like nothing. In fact, Dot Physics calculated that if allof us were to get together in one location and all jump 30 cm into the air at the exactsame time, we would push Earth away from us a tiny amount.
Earth would only move away from us about 1100thof the width of a single Hydrogen Atom. And here's another thing. Because we're all jumpingand then going back to where we started, Earth is just going to move back to where it started. So, our big jump won't be able to change Earth'sposition in space, but, c'mon, 7 billion people all jumping togetheré That's gotta be ableto cause some sort of seismic activity, righté So let's say you have a lot of people alltogether in one place and you have them all jump on: 123! Did you feel thaté Well, the BBC did thiswith 50,000 people and discovered that a
kilometer and a half away, it only registereda .6 on the Richter scale. You would need 7 million times more people than even liveon Earth right now to jump at once to recreate the earthquake that recently happened in Japan. So, even though we're all awesome, comparedto the size of the Earth, we're not much. But don't get too discouraged. Our collectivejump would contain a lot of energy. The Straight Dope calculated that even if only the peoplewho lived in China got together and jumped, their jump would be the equivalent of 500tons of TNT. Of course, 500 tons of TNT doesn't do much to an Earth that weighs6 sextillion 588 quintillion tons.
Felix Baumgartners supersonic freefall from 128k Mission Highlights
Release! I know the whole world is watching nowâ€¦ I'm going home now. Jumper away. Speed 725. Showing Felix at a stable descent. And Felix is back down to Earth safely. The new world record holder.