But once in an indigo twilight, under the sparkling array of fat blurry stars, he grew uneasy. “The snowy poles of moonless Mars,” Tennyson had written just a few years before the discovery. Moonless Mars. It was in this hour that Phobos had used to shoot up over the western horizon like a flare. A moment of the areophany if ever there was one. Fear and Dread. And he had completed the desatellitization himself. They could have popped any military base built on Deimos, what had he been thinking? He couldn’t remember. Some kind of desire for symmetry; down, up; but symmetry was perhaps a quality prized more by mathematicians than other people. Up. Somewhere Deimos was still orbiting the sun. “Hmm.” He looked it up on the wrist. A lot of new colonies were starting out there: people were hollowing out asteroids, then spinning them to create a gravity effect on their insides, then moving in. New worlds.

A word caught his eye: Pseudophobos. He tracked back, read; informal name for an asteroid that somewhat resembled the lost moon in size and shape. “Hmmm.” Sax tapped around and got a photo. Well, the resemblance was superficial: a triaxial ellipsoid, but weren’t they all. Potatoshaped, right size, banged hard on one end, a Stickneyesque crater. Stickney; there had been a nice little settlement tucked into it. What’s in a name? Say they dropped the pseudo. A couple of mass drivers and Als, some side jets . . . that peculiar moment, when Phobos had shot up over the western horizon. “Hmmmmm,” Sax said.

• • •

The days passed and the seasons. He did field studies and meteorology. Effects of atmospheric pressure on cloud formation. Meaning drives out around the peninsula, then a walk, then out with the balloons and kites. Weather balloons these days were elegant things, instrument packages less than ten grams, lofted by a bag eight meters tall. Capable of rising right into the exosphere.

Sax enjoyed arranging the bag over a smooth patch of sand or grass, the top downwind from him, then sitting and holding the delicate little payload in his fingers, then flicking the toggle that shot compressed hydrogen into the balloon, and watching it fill and yank up at the sky. If he held on to the line he was almost hauled to his feet, and without gloves on the line would cut his palm, as he had quickly learned. Release it then, thump back to the sand, watch the round red dot shimmy up through the wind, until it was a pinprick and then could no longer be seen. That happened at around a thousand meters, depending on the haze in the air; once it had happened as low as 479 meters, once as high as 1,352 meters, a very clear day indeed. After that, he would read some of the data on his wrist, sitting in the sunshine feeling like a little piece of him was sailing up into space. Strange what made one happy.