0:00 By the 1840s, the planet Uranus was a cosmic delinquent.0:04 It was consistently off its predicted course, sometimes ahead, sometimes behind, refusing to follow the path Newton's laws demanded.0:15 And that was a HUGE problem.0:17 I mean, a really big one.0:19 It meant one of two things: either Newton was wrong, which was unthinkable...0:25 or something else was out there.0:27 Right.0:28 And it’s another one of those stories, like we talked about last week with those great scientific rivalries, where the human obsession is the real engine of discovery.0:41 Oh, completely.0:43 Because solving this wasn't just about finding a new planet.0:47 It was about saving the order of the universe as they knew it.0:52 So, you have this mystery hanging over astronomy.0:56 And in two different countries, two men, who don't know each other, become obsessed with solving it.1:04 Exactly.1:05 In England, you have John Couch Adams.1:08 He’s a brilliant, shy, 24-year-old Cambridge student.1:12 He basically decides, for his own personal project, that he’s going to find this phantom planet with nothing but a pen and paper.1:22 Which is just...1:24 wild to think about.1:25 He's reverse-engineering the gravitational pull of an invisible world.1:31 Pure mathematics.1:32 And he does it!1:33 By September 1845, he has the calculations.1:37 He knows where the planet should be.1:40 But here’s where the human drama really kicks in.1:44 He sends his work to the Astronomer Royal, a man named George Airy.1:49 And Airy… well, he kind of blows him off.1:52 Yeah.1:53 It's a classic case of institutional blindness.1:56 Airy is the establishment.1:59 Adams is a nobody.2:00 He asks for a clarification on a minor point, Adams doesn't reply immediately, and Airy just...2:08 shelves it.2:08 The discovery of a new world, sitting in a pile of papers on a desk.2:14 He literally missed the chance because he was at dinner when Adams came to call.2:20 It's infuriating.2:22 So while Adams's work is gathering dust in England, the same problem is officially given to France's top mathematical astronomer.2:32 Urbain Le Verrier.2:33 And he is the polar opposite of Adams.2:36 He's confident, established, a bit arrogant… and an absolute bulldog when it comes to a problem.2:44 A bulldog is the perfect word.2:47 He attacks the problem with this incredible force of will.2:51 He doesn't just calculate where the planet is; he calculates its mass, its orbit, everything.2:59 He’s so sure of himself.3:01 So sure that in the summer of 1846, he publishes his findings and basically tells the astronomers of France, "Point your telescopes here." And they don't!3:13 They’re skeptical.3:14 They think he's overconfident.3:17 So Le Verrier gets frustrated.3:19 Okay, so what does he do?3:21 He thinks, who has the best star charts?3:24 Who is meticulous enough to do this right?3:28 And he writes a letter.3:29 Not to someone in France, but to Johann Galle at the Berlin Observatory.3:35 He sends his prediction, the coordinates for an unseen planet, through the mail.3:42 Yes.3:42 The letter arrives in Berlin on September 23rd, 1846.3:46 Galle gets permission from his director to look that very night, though the director is doubtful.3:54 I can just picture the scene.3:56 Galle, maybe a little skeptical himself, points the telescope to the exact spot Le Verrier told him to look.4:05 And there it is.4:06 Wait—just like that?4:08 Not quite.4:09 He sees a star that isn't on his chart.4:12 But a star could be anything, a mistake in the chart.4:16 He has to be sure.4:17 So he and his assistant, Heinrich d'Arrest, keep watching it.4:22 And within an hour, they confirm it.4:25 The "star" had moved.4:27 It wasn't a star.4:28 It was a planet.4:29 Neptune.4:30 Found within one degree of where Le Verrier’s math said it would be.4:35 It's maybe the most dramatic proof of celestial mechanics in history.4:41 A world predicted into existence.4:44 So Galle writes back to Le Verrier the next day.4:47 The letter starts, "Sir, the planet whose position you have pointed out actually exists." Can you imagine getting that letter?4:58 The vindication.4:59 The sheer intellectual triumph.5:01 Of course, then the fight started over who really discovered it.5:06 The English suddenly remembered Adams's calculations, and it became this ugly nationalist dispute.5:14 But in the end, they're both credited.5:17 Adams and Le Verrier.5:19 The shy student and the arrogant master.5:22 As they should be.5:24 They both, uh, independently conquered the same impossible mountain.5:29 But the discovery itself...5:31 it changed something.5:33 It wasn't just about finding another rock floating in space.5:38 What did it change?5:39 It was a moment of profound confidence for humanity.5:43 It proved that the universe wasn't just chaotic and mysterious.5:48 It was a machine, yes, but a machine whose rules we could understand.5:54 It showed that with just the power of our minds, we could reach across hundreds of millions of miles of darkness and say, "There.6:04 A world is there." And we could be right.
