A Celestial Rodentia adventure: The Tale of Mercury (1/8)
Many weeks into the long flight to Mercury, a small light blinked on above the hatch in the Meadow Deck, and Cosmo's voice crackled with excitement over the ship's speakers.
"Hay Day, Hay Day, Hay Day!" he announced, like it was the best news in the history of the solar system, which, on the Celestial Rodentia, it more or less was. "Supply pod incoming! All paws to the Meadow Deck!"
Hay Day happened every seven days, whenever the ship's little resupply pod caught up with them from behind, packed full of fresh Earth-grown timothy hay, and it was, without question, the crew's favorite tradition of the whole journey. Guinea pigs need a steady supply of hay every single day, not just for snacking but because their teeth never stop growing and their stomachs need the constant chewing to work properly, and Mission Control back home had built the whole resupply schedule around that one very important fact.
By the time Gizmo pulled herself into the Meadow Deck, hand over hand along the ceiling rail, the rest of the crew was already gathered by the round hatch, watching the little pressure light tick from red to yellow to green.
"Everybody ready?" Rocky asked, bracing himself with both back paws hooked under a floor rung. Even after all these weeks, hauling in the hay pod took real muscle, since a floating crate the size of a filing cabinet still had all its weight, just none of its gravity, and swung around exactly as much as you'd expect something that heavy to swing.
"Ready," said Nova, practically vibrating in place. She had grown up in her family's greenhouse back on Earth and still got the same little thrill every week when new hay arrived, like unwrapping a present that smelled like summer.
The hatch hissed open, and the crate drifted through in dreamy slow motion, turning gently end over end, trailing loose wisps of hay that spun off into the air like confetti.
Rocky caught it first, planting it with a grunt, and Nova was already there beside him, popping the latches with quick, practiced paws.
The moment the lid came off, the whole Meadow Deck filled with the smell of fresh-cut hay, and every guinea pig on board went absolutely wild.
Wheeking is the sound guinea pigs make when something wonderful is about to happen, a loud, high, excited squeal that usually means food, and right now the entire crew was doing it at once, a small chorus of delighted noise bouncing off the curved walls.
Gizmo could not help herself. She planted all four paws against the deck, gathered herself, and popped straight up into the air, twisting sideways at the top before drifting slowly back down.
Any guinea pig owner back on Earth would have recognized the move instantly. It's called popcorning, a happy guinea pig suddenly leaping for no reason except that life is good and their legs have decided to celebrate. On solid ground, a popcorn jump lasts about half a second before gravity pulls the guinea pig back down. Up here, with nothing pulling her back, Gizmo's jump just kept going, carrying her in a slow, delighted spin all the way up toward the ceiling.
"I love this part," she announced, tumbling gently, one paw still clutching a fresh stalk of hay. "Every single week, I forget, and every single week it's the best surprise ever."
"You don't forget," said Luna, floating calmly near the hatch with her paws folded, watching the chaos with the fond patience of someone who found the whole scene very funny and would never admit it. "You do it on purpose. That's the eighth time you've popcorned into a hay crate this trip. I've been counting."
"Eight wonderful times," Gizmo agreed, catching a ceiling handle and pushing herself back down. "A guinea pig should have hobbies."
Starlight floated near the back wall, quieter than the others, tucking loose stalks of hay into a storage net with careful, tidy paws. She wasn't much for shouting or popcorning, but she smiled at the noise around her, whiskers twitching happily with every burst of excitement, the way she always seemed to feel things a little more than she showed.
For a few minutes, nobody was thinking about the millions of empty miles outside the hull, or how long they had been traveling, or what strange new world was waiting up ahead. There was just fresh hay drifting through the air, and friends laughing together, and the low, steady hum of the Celestial Rodentia carrying them onward.
Then Luna's collar chirped.
Everyone stopped.
Luna's collar only chirped for one reason. She glanced down at the small blinking light, and her calm expression sharpened into something more focused, the way it always did right before something important happened.
"Proximity alert," she said. "Bridge. Now, please."
✦ ✦ ✦
By the time the whole crew had pulled themselves hand over hand along the corridor ropes and gathered at the front window, everyone could feel it: a strange, tightening kind of excitement, like the moment right before you find out a surprise.
The bridge window was the biggest one on the ship, a wide curved pane of reinforced glass that Rocky liked to call "the best television in the solar system." Right now it showed a small, brilliant, silvery dot, brighter than any star around it, sitting close enough to the blazing sun that it seemed almost brave for being there at all.
"That's it," Luna said quietly. "That's Mercury."
"It's so close to the sun," Nova said, awed. "Doesn't it get cooked?"
"On the day side, yes," said Luna. "Terribly. But that's exactly why this next part of the flight is tricky, and why I called everyone up here. I need Rocky at the engines, and I need everybody strapped in."
Rocky was already pulling himself toward the engine room, tail flicking with focus. "Tricky how?"
Luna brought up a glowing diagram on the bridge console, a curved line swooping down toward a bright yellow circle. "Here's the strange part," she said. "You'd think getting to a planet near the sun would mean going faster. Speeding up. But it's the opposite. The closer we get to the sun, the harder its gravity pulls on us, and the faster we go, whether we want to or not. It's like rolling a marble down a hill that never ends. If we don't slow the ship down very, very carefully, we won't land at Mercury at all. We'll go screaming right past it and keep falling toward the sun forever."
"That sounds bad," said Cosmo.
"It would be," Luna agreed. "So instead of firing our engines forward to speed up, the way you might expect, Rocky is going to fire them backward, in careful little bursts, to slow us down at exactly the right moments. Mission Control mapped us a path that swings us close by a couple of other worlds first, so we can borrow a little energy from their orbits instead of burning fuel, the way you'd slow yourself down by grabbing a pole while running past it."
"So that's why we've been curving instead of flying straight there," Nova said, working it out loud.
"Exactly," said Luna. "It's the same trick real spacecraft use to reach Mercury back home. Getting there gently is like trying to land softly at the bottom of a cliff a million miles tall. You don't do it by racing down. You do it by braking the whole way, a little more each time we pass somebody."
"Understood," said Rocky, already halfway into the engine room. "Braking the whole way. I love a challenge that isn't about being fast for once."
For the next hour, the ship hummed with quiet, careful work. Rocky called out small corrections. Luna watched the numbers with total concentration, her paws steady on the controls. Starlight, tucked in beside her, caught a tiny wobble in one of the thruster readings before it became a real problem and quietly flagged it, the way she always did, without needing anyone to praise her for it (though Luna gave her a grateful nod anyway, and Starlight's ears went a little pink with pride).
Bit by bit, the silver dot outside the window grew from a point of light into a small round world.
✦ ✦ ✦
Mercury did not look like anything the crew had visited before.
It hung outside the window like a scarred grey marble, its surface covered in craters of every size, some tiny, some enormous, stacked on top of each other from billions of years of getting hit by space rocks with nothing in the way to stop them. There was no soft blue haze around it like Earth had. No thick orange clouds like Venus. Just bare, cratered rock, sitting alone in the glare of a sun that looked bigger and fiercer here than anywhere else the crew had ever been.
"It's like the moon," Nova said, pressing her nose to the glass. "But angrier."
"It's the smallest planet in the solar system," Gizmo said, reading from her data pad, "and it barely has any air at all. Just the thinnest possible wisp of a few loose atoms, way too thin to call a real atmosphere. Scientists call it an exosphere. There's nothing here to hold in warmth or block out cold."
"Which explains that," Luna said, pointing.
The crew looked closer and saw it: a hard, sharp line cutting across the planet's face, dividing it clean in half. On one side, blazing white-hot daylight. On the other, a darkness so black it looked like a piece had been cut out of the world.
"That's the line between day and night," Luna explained. "On the sunny side right now, it's around eight hundred degrees Fahrenheit. Hot enough to melt certain metals. On the dark side, at the very same moment, it can drop to nearly three hundred degrees below zero. Mercury has almost no air to carry heat from one side to the other, so the two sides barely know the other one exists."
"How do you even survive a place like that?" Nova wondered.
"You don't try to survive both sides at once," said Luna. "You land right along that line in between, where the temperature is much gentler, and you stay close to it while the planet slowly turns beneath you."
"Wait," said Cosmo, doing math out loud, which he did badly and cheerfully. "If the planet's spinning, won't the mild spot just move away from us?"
"Very slowly," said Luna, and there was a small smile in her voice. "One full day here, sunrise to sunrise, takes a hundred and seventy six Earth days to finish. Mercury actually zips around the sun much faster than that, in only eighty eight days, so it finishes two whole trips around the sun before it even finishes turning through one single day. We have plenty of time before that line moves anywhere at all."
"This planet," said Cosmo, "has its whole schedule backward."
"This planet," Gizmo said, delighted, "is the best kind of strange."
The Celestial Rodentia dipped low, riding along the twilight line where gold sunlight met deep shadow, and settled onto the grey surface with a soft, crunching landing that sent up a small cloud of ancient dust.
✦ ✦ ✦
They stepped out together into the rover bay first, the small pressurized dome that let them look out at Mercury without stepping directly into air so thin it could not be breathed and cold or heat so extreme it could not be survived unprotected. Through the dome's curved windows, the landscape spread out in every direction: rolling grey plains, deep round craters, and, scattered everywhere across the ground like a lumpy grey carpet, boulders. Hundreds of them. Thousands, maybe. All different sizes, all sitting perfectly still in the strange gold light of the almost-sunset line.
"It's so quiet," Nova whispered. "And so empty."
"Not a single moon in the sky," Gizmo added. "Mercury doesn't have any at all. Just it, and the sun, and all this rock."
Starlight didn't say anything. Her whiskers had gone very still, then started twitching in a pattern the others had learned to pay attention to over the months: quick, small movements, like she was listening to something nobody else could hear.
"Starlight?" Luna asked gently. "What is it?"
"That boulder," Starlight said slowly, pointing one small paw toward a rounded grey shape about the size of the rover itself, sitting maybe thirty feet away. "It's a slightly different color than the ones around it. And a minute ago, it wasn't in the same spot."
Everyone went very still.
"Rocks don't move," said Rocky, though he said it slowly, like he was already doubting it.
"They shouldn't," Starlight agreed. "But it did. Just a little. Like it was stretching."
For a long moment, nobody breathed. Then, out on the dusty grey plain, right at the edge of the golden twilight line, the boulder Starlight had pointed to shifted again. A crack of warm light seemed to glow faintly along one of its seams, like sunrise creeping under a door. Then another boulder nearby did the same thing. And another. All along the line where day was slowly, slowly arriving after nearly ninety long Earth days of darkness on that patch of ground, the "rocks" were waking up.
"They're not rocks," Nova breathed, pressing both paws to the glass. "They never were rocks."
They watched, hardly daring to move, as dozens of boulder shapes across the plain unfolded, stretched, and rose, revealing rounded stone bodies with warm glowing seams and deep, patient eyes that blinked slowly against the returning light for the first time in what must have felt like forever.
"Lithorians," Gizmo whispered, remembering the name from an old mission logbook Mission Control had sent along before launch. "They must be Lithorians. They live through Mercury's temperature swings by going still and cool during the freezing night, almost like sleeping stone, and waking up again when the warmth returns."
One of the nearest Lithorians turned its rounded head toward the little dome and the six small, wide-eyed faces pressed against the glass. It made a low, warm sound, like stone settling after a long winter, and the glowing seam along its back brightened into something that looked, unmistakably, like a smile.
"I don't think it's dangerous," Starlight said softly. "I think it's happy we're here."
✦ ✦ ✦
The Lithorians, it turned out, had been waiting a very long time for visitors.
They spoke slowly, in low rumbling tones that the ship's translator worked hard to catch, but their meaning came through warm and clear: they had felt the Celestial Rodentia rumble down through the thin exosphere hours ago, and they had been curious ever since, patiently waiting for the light and warmth to reach far enough for them to properly wake and greet their guests.
One elder Lithorian, whose stone was etched with faint lines like the rings of an old tree, rolled closer to the dome and spoke directly to Gizmo, who had stepped forward as commander.
"You come from the small green world," the elder rumbled, "the one that spins so quickly it barely feels its days at all. We have watched your kind's little machines pass by before. It is rare that visitors stay long enough to see us wake."
"We'd love to stay," Gizmo said. "We'd love to see everything. All of it, if you'll let us."
The elder made a low, rumbling sound that might have been a chuckle. "Then perhaps you should not try to see it all together. Our world is large in its own quiet way, little travelers, larger than it looks from above. The magnetic storms swirl strangest near our poles. The oldest ice sleeps hidden and untouched in craters the sun has never once reached. The deep basins remember impacts older than your whole solar system's memory. One small ship cannot see it all in a single golden afternoon."
Luna glanced at the crew, already understanding. "Then we should split up," she said. "Each of us can follow what pulls at us most."
It was decided quickly, the way good plans often are once everyone already half agrees. Nova would go with a young Lithorian guide to study the strange rock-and-mineral biology of their bodies, already bubbling over with a dozen questions. Rocky wanted to see how Lithorians dealt with heat and pressure in their tunnels, comparing notes engineer to engineer. Luna would chart the odd, twisting "magnetic tornadoes" the elder mentioned, funnels of solar wind caught in Mercury's surprisingly weak magnetic field, only about one percent as strong as Earth's own, yet apparently strong enough to make trouble worth investigating. Cosmo, naturally, wanted to work on properly translating the Lithorians' slow stone language beyond what the ship's little translator could manage. Gizmo would visit the permanently shadowed craters near the pole, where the elder promised something Gizmo could hardly believe: real ice, hiding in the dark, on the planet closest to the sun.
That left Starlight.
She had gone quiet again, the way she did when she was trying to be small enough not to be noticed volunteering for anything.
"Starlight," the elder Lithorian rumbled, turning its ancient, patient face toward her. "You heard me shift before any of your crewmates saw it. Your ears and whiskers caught what our own kind almost missed noticing about ourselves. I would very much like to show you the deep listening caves, where the whole planet's creaks and settles can be heard, if you are willing to come alone."
Starlight's whiskers twitched, quick and nervous.
Rocky, floating just behind her, nudged her gently with one paw. "You caught the thing none of us caught," he said. "That's not luck. That's you being exactly the right guinea pig for this."
"Prey animals get nervous going off alone," Gizmo added kindly. "It's in our nature. We're built to feel safer in a group. But sometimes the bravest thing a guinea pig can do is trust that she's ready, even when her whiskers are still a little jumpy about it."
Starlight looked out at the waking grey plain, at the golden light creeping slowly across ancient stone, at a whole world of quiet listening just waiting to be heard.
"Okay," she said, and her voice came out steadier than she expected. "Okay. I'm ready."
✦ ✦ ✦
That evening, if you could call it evening on a planet where a single sunrise took a hundred and seventy six Earth days just to arrive, the crew gathered briefly back at the Celestial Rodentia to compare notes before their long day of separate discoveries truly began. Six small headlamps clicked on against the strange gold twilight. Six sets of paws, one Lithorian guide each waiting patiently nearby.
"Same time tomorrow?" Cosmo asked, already grinning at the adventure ahead.
"Same time tomorrow," Gizmo agreed. "Everybody be careful. Everybody be curious. And everybody come back with a good story."
One by one, the crew of the Celestial Rodentia headed off in six different directions across the oldest, strangest, most patient little world they had ever visited, each one walking beside a new friend made of warm, glowing stone.
Somewhere out past the twilight line, a whole planet's worth of Lithorians kept waking up, one boulder at a time, into the light.
To be continued in Journey to Mercury (2/8)...
A Celestial Rodentia adventure, brought to you by GCAGE.