A Freezing Night in Bath: The Discovery of Uranus

Journalist: Welcome, listeners, to another journey through time. The air tonight is bone-chillingly crisp. I am standing in the modest back garden of nineteen New King Street in Bath, England. The year is 1781. The spring frost is still clinging to the cobblestones, and towering above me in the dark is a rather peculiar contraption of wood and metal—a homemade seven-foot reflecting telescope. Beside it stands a woman whose tireless work is quietly reshaping our understanding of the cosmos. Caroline Herschel, thank you for allowing me to visit your home at such an ungodly hour.

Caroline Herschel: You are entirely welcome, though I must ask you to keep your lantern angled downward. William has just gone inside to warm his hands, but if you ruin our night vision before he returns, he will be terribly cross. And please, step away from that polishing block. Thomas, the local ironmonger, just delivered a new load of pitch, and it is remarkably sticky.

Journalist: I will be careful, I promise. Caroline, the scientific world is absolutely buzzing. Just weeks ago, on the night of March thirteenth, your brother spotted something in the constellation Gemini. Something that is about to double the size of the known solar system. Can you take us back to that night?

Caroline Herschel: Oh, it was bitterly cold. Much colder than tonight. We were conducting one of our regular sweeps of the sky. People think astronomy is a matter of looking up and waiting for God to show you a miracle. It is not. It is endless, methodical sweeping. Up and down, degree by degree. William was at the eyepiece of the seven-foot reflector, balancing on a wooden ladder, and I was stationed at my desk inside the open window.

Journalist: So you were not looking through the telescope yourself?

Caroline Herschel: Heavens, no. Someone must do the actual work of recording, calculating, and managing the time. I sit by the window with a copy of the British Catalogue, my mathematical tables, a clock, and a ledger. William calls out the coordinates and magnitudes, and I write them down. On the night of the thirteenth, he suddenly shouted down to me that he had found a curious object. He said it was either a nebulous star or perhaps a comet. It appeared as a distinct disk, you see, not a point of light like the fixed stars.

Journalist: And when he said the word comet, what went through your mind?

Caroline Herschel: Panic, mostly. Comets move. If you do not record their exact position relative to the neighboring stars immediately, you lose them. I remember my fingers were so stiff from the cold I could barely grip my quill. In fact, earlier that week, the weather was so foul that the very ink had frozen in my bottle. Mary, our housekeeper, had to bring me a warmed brick just to keep my hands functioning. But that night, we tracked it. We noted its position, and over the next few nights, we saw it moving steadily against the background stars.

Journalist: But it was not a comet. It is a planet. A new world, orbiting far beyond Saturn. The first planet discovered since the dawn of human history.

Caroline Herschel: Yes. Though we did not dare to call it a planet at first. We are musicians by trade, you must understand. William is an organist, and I was trained to sing soprano in his concerts. The Astronomer Royal, Nevil Maskelyne, and others in London had to confirm the mathematics. But the orbit is nearly circular. It is a planet. And to think, it has been sitting there in the dark since the beginning of time, waiting for our little homemade mirror to catch its light.

Journalist: Speaking of that mirror, the telescope you are using is reputed to be better than the ones at the Royal Observatory. How does a musician in Bath build the world's most powerful telescope?

Caroline Herschel: By completely destroying the peace of our household, I assure you. To get a mirror to gather enough light to see this new planet, the speculum metal must be polished to a perfect parabolic curve. It is an excruciating process. Once you begin polishing the metal, you cannot stop, or the shape is ruined. Just last month, William polished a mirror continuously for sixteen hours.

Journalist: Sixteen hours? Without stopping?

Caroline Herschel: Not for a single second. If he took his hands off the metal, the temperature would change, and the curve would distort. I had to feed him his meals by putting the food directly into his mouth while he worked. I remember feeding him bits of roasted mutton and bread, wiping the sweat from his brow, while our brother Alexander turned the lathe. The entire house smelled of horse dung, which we use for the casting molds, and hot pitch. John, the baker at the end of the street, crossed himself the other day when he saw us, convinced we are practicing dark alchemy.

Journalist: It sounds more like a heavy industrial foundry than an astronomical observatory.

Caroline Herschel: It is both. And a music studio, though the music is slowly fading away. This discovery, this new world, it changes everything. William intends to name it Georgium Sidus, after King George, in hopes of securing a royal pension so we might finally abandon music and devote our lives entirely to the stars.

Journalist: The name Uranus is already being whispered on the continent, keeping with the mythological names of the other planets. But whatever it is called, the realization must be staggering. You and William have peered further into the void than any human beings in history. Does the vastness of it ever terrify you?

Caroline Herschel:

Terrify me? No. The universe is profoundly rational. When I lived in Hanover, I was essentially a scullery maid in my mother's house. I was told I was too plain to marry and too uneducated to do anything but sweep floors and knit stockings. Looking up into the heavens, calculating the exact trajectory of a celestial body using spherical trigonometry, it is not terrifying. It is liberating. It is pure order.

Journalist: You are currently the assistant, the one keeping the ink from freezing and the records exact. But looking at your notes here on the table, I see you are charting your own paths across the sky.

Caroline Herschel: William has built me a small sweeper telescope of my own. A lovely little Newtonian reflector. When he is not demanding my attention for his deep sky surveys, I have begun to sweep the sky for comets myself. I have mapped out a systematic approach. I start at the horizon and move upward. There is so much out there that the French and the British astronomers have missed simply because they do not have the patience to look at every single point of the sky. We look at everything.

Journalist: I have no doubt you will find your comets, Caroline. In fact, history might just remember you as the first woman to discover one.

Caroline Herschel: That is a very bold prediction from a stranger in my garden. I will settle for finishing tonight's sweep without catching pneumonia. Now, if you are quite finished with your questions, the clouds are parting toward the east, and I must check the calibration on the micrometer. The heavens do not wait for idle chatter.

Journalist: Of course. Thank you, Caroline Herschel, for your time, your brilliance, and for braving the cold to show us the edge of the universe. Listeners, we leave the Herschels here in the freezing dark of 1781, their eyes pressed to the eyepiece, pushing the boundaries of human knowledge one painstaking, shivering observation at a time. Until our next journey, keep looking up.