You do it out loud, and Mars, which does not care, happens to match.

Leaf Hall keeps a noon you made. The tomatoes sit like small fists that intend to be food. Greens stay short and dark, not pale tourists. Hearth’s air is a people-number. Leaf Hall’s air is a plant-number. The damper is a cousin, not a hug. Roots breathe in pores that still have pockets. The skull-tomato bin stays a joke that worked. Lina’s tether stays a tether you used, or a tether you respected by coming in.

Imani points at you when the last item is checked. “That’s a save.”

The storm can keep the sky. You did not need a clear day. You needed photons from a bank, carbon dioxide on the correct side of a wall, water that listened to a sensor, and a breeze for a leaf’s thin coat. On Tharsis the dust still writes on the glass. It wrote the whole time you were clever, and the whole time you were correct. Correct is quieter.

Oskar names a pump for the fun of it. Lina dots her visor with cinnamon and then cleans it, which is the whole sport in miniature. GROVE logs a light curve that looks like a valley with a handmade sun at the bottom.

You look at the brown port and understand the joke of being a person in a bubble on a dry world: the planet is always trying to be the air. You just keep the bubble honest, together, with numbers that match the plants and the people, who do not eat the same meal.

A drip hits the catchment with a tick as small as a seed. Oskar grins like a man who has heard a favorite song. Lina checks a tether she is not using, which is how people stay in practice. Imani writes storm sol, crop held as if it were ordinary, because the point of a good checklist is to make a miracle look like a Tuesday.

Later there will be forms. There will be a doctor shining a light in your eyes and a person on Earth-delay who says good work in a voice that has said not good work to other crews. For now there is tea, a bored computer, and a tomato that is not a rumor.

You write three lines in your grower log: I asked for the light curve. I split the air. I did not open Mars like a window. It is not poetry. It is a map for the next kid.

THE END

What you learned: a greenhouse is several problems at once—photons, carbon dioxide as plant food (and people-poison in the hab), water as pore space, fans as weather, dust as a brown sweater on glass, and other humans. The choice that wins matches how plants and pressure actually work, done with a checklist and a team. Guessing is louder. Thinking feeds more.