They were inside the orbit of Io now, Kiley sliding through the penumbra, falling in towards the gas giant. Perspective altered, Jupiter was definitely below now. Something so vast could never be overhead. Its curvature was flattening out, edges merging with distance, cloudscape expanding into an unending plane. if she looked up she could see Io; a volcano's mushroom fountain of sulphur just north of the equator belching upwards. A cold dragon flame cascading in glorious low gravity slow motion.

The stormband below Kiley was a pallid rust-yellow, ocean-sized elliptical cyclones and anti-cyclones of ammonium hydrosulfide grinding in conflict, buffeted by supersonic jetstreams. Clots of white cloud bloomed as whirlwind vortices sucked frozen ammonia crystals up from the hidden depths. They spilled into the churning cyclone walls like cream into coffee, diffusing and dispersing.

Then the terminator was ahead of them, a shadow straddling the nearly flat horizon. Firefly lights twinkled beyond.

Was I such a challenge to you? Julia asked sadly. I thought you were the one person in the world who saw me as me, as Snowy, not some plutocrat bitch. I was alive then, when you held me.

Your heritage is the challenge, the barrier. Not you. You, Snowy, you I love. Did you need to be told that?

I could give it all up. For you.

No, no, no.

No.

You are the one who is complete, Snowy. I envy you that. Me, I still have to find your peak And I can. I can.

Kiley glided into the umbra. It was night below, but not dark. Lightning twisted between the imperious cloud mountains, tattered dazzling streamers that illuminated thousands of square kilometres with each elemental discharge. Comets sank down gracefully amid the storms, rocky detritus from the rings sucked in by the monstrous gravity field, braked by the ionosphere, flaring purple, spitting a tail of, slowly dimming sparks.

Kiley began its deceleration burn, sending out a five-hundred-metre spear of plasma. The top of the atmosphere was only seventy-five kilometres below now. Julia could sense the massive flux currents seething through the thin fog of molecules, glowing red veins pulsing strongly.

The burn ended abruptly. The image juddered as explosive bolts fired. Empty spherical hydrogen tanks and lenticular giga-conductor cells separated, tumbling away. Small chemical thrusters fired, stabilizing the modules which remained. Kiley began its coast up to the rings.

Do you see now, Snowy? The silent savagery of this place, its hostility. Yet amid all this, there is life.

Kiley found the microbes?

Oh, yes.

Is that all it found?

How could there be more?

A spaceship, a starship.

No. Is that what you are dealing with, a starship? Your trouble.

I don't know, Royan, I really don't. I've got people working on it, Greg, Victor, Suzi.

The old team. That's nice. They're good, they'll find you an answer.

They need to find you, Royan. Where are you?

I don't know. How could I?

Then why were you left in storage? What are you here to warn me about?

Potential. The potential of the microbes. But I was so sure. I had it all worked out.

Show me.

The rock reminded her of Phobos. It had that same barren grey-yellow colour, a battered potato outline. Except it was much smaller, barely a hundred metres long, sixty wide. Kiley hovered beside it, optical sensor images degraded by the dry mist of ring particles. Wavering braids of dust motes and sulphur atoms shimmered in the raw sunlight, moving sluggishly.

Jupiter's crescent eclipsed the starfield a hundred and twenty thousand kilometres away. Even from this height, the dancing lights of the darkside were easily seen. Like Earth's cities, she thought, the idea momentarily distorting scale.

Kiley's close-range sensors were stirring, focusing on the rock. It had worn down over the aeons, its surface abraded by the gentle unceasing caress of dust. Impact craters and jagged fracture cliffs smoothed down to soft curves. One end was scarred by a white, splash-pattern of methane frost, tapering rays extending their grip over a third of its length.

Lasers swept the rock from end to end, building a cartographic profile within the on-board lightware processors.

Cold gas precision positioning thrusters fired, moving the probe closer in centimetre increments. When it hovered a metre above the rock, microfocus photon amps telescoped out of their cruise phase sheaths, aligning themselves on the surface.

The image changed, a lunar mare strewn with boulders; Julia knew she was seeing the dust motes sticking to the rock. Kiley's lightware processors began to run a spectrographic analysis program. She watched the image alter, as if it had been overlaid with a grid of square lenses. Data began to flow back into the probe's lightware as the blurred squares were examined one by one.

Kiley's photon amps quartered a square metre of the rock's surface a millimetre at a time, then it fired its cold gas thrusters and moved to the next section. Again. Again.

The fourth time, one of the photon-amp grid squares flared red. The eight surrounding ones were immediately reviewed by the spectrographic program. It registered carbon, hydrogen, and various trace minerals.

The block of squares expanded to fill her vision, regaining their focus.

There, Royan said in awe. In the middle of a desolation more profound than Gomorrah: life itself. And what life.

The photon-amp focus was at its ultimate resolution, centred on a clump of microbes. They looked like a smear of caviare, tiny spheres, tar-black, sticky; they glistened with a dull pink light thrown by Jupiter's albedo.

Call it Jesus, call it Gaia, call it Allah, said Royan. Whatever name you wish to bestow, but don't tell me God doesn't exist. The true miracle of this universe is life itself. Left to fate, to random chance groupings of amino acids in the primal soup, it could never happen. Never! We may evolve as Darwin said, man may not have been made in God's image; but that spark, that very first spark of origin from which we grew, that was not nature. That was a blessing. We are not a side product of an uncaring cosmos, a chemical joke.

You're preaching to the converted, remember? She wasn't surprised by his outburst, nor its intensity; both of them had a strong quasi-religious background; her at the First Salvation Church, him with the Trinities, it was another thread in their bond.

Kiley's sampling waldo slid out, micromanipulator claws closing around the clump of microbes. It retracted and placed them delicately inside the probe's collection flask.

Cold gas thrusters fired again, backing Kiley away from the rock. The lightware processors began to check over the propulsion systems.

You did this for me? Julia asked.

I did. Do you see now, Snowy? Do you see the why of it?

Kiley's chemical thrusters fired for a long time, lifting it out of the ring's inclination, into free space where the plasma drive could be used. Star trackers locked on to their target constellations, orientating the probe for its flyby manoeuvre burns.

No, she said, inexplicably humbled by the admission. She could sit and think, run a logic matrix, tear the problem apart. Answers never eluded her when she was in that state, a determined computer/human fusion. But somehow just the thought of expending all that effort inhibited her. Perhaps this appalling vastness of the gas giant's domain had numbed her into dormancy.

Kiley was shedding mass, discarding its primary mission modules, the sampling waldos, precision attitude thrusters, photon-amp booms, laser scanners, all peeling off like mounting scales. She watched them go, oblong boxes and spidery cybernetic arms, adding to the gas giant's ring. In a few thousand years vacuum ablation would reduce them to tissue flakes, a swarm of slowly dissipating metallic confetti.