"I'm sorry, my love. I just sometimes feel —" He sighs. "Age is a process of closing off opportunities behind you. I'm not young enough anymore – I've lost the dynamic optimism."

The data sample on the pirate server differs from the one Annette's implant is processing.

"You'll get it back," she reassures him quietly, stroking his side. "You are still sad from being mugged. This also will pass. You'll see."

"Yeah." He finally relaxes, dropping back into the reflexive assurance of his own will. "I'll get over it, one way or another. Or someone who remembers being me will …"

In the darkness, Aineko bares teeth in a silent grin. Obeying a deeply hardwired urge to meddle, he moves a file across, making a copy of the alien download package Annette has been working on. She's got a copy of number two, the sequence the deep-space tracking network received from close to home, which ESA and the other big combines have been keeping to themselves. Another deeply buried thread starts up, and Aineko analyses the package from a perspective no human being has yet established. Presently a braid of processes running on an abstract virtual machine asks him a question that cannot be encoded in any human grammar. Watch and wait , he replies to his passenger. They'll figure out what we are sooner or later.

The asteroid is running Barney: it sings of love on the high frontier, of the passion of matter for replicators, and its friendship for the needy billions of the Pacific Rim. "I love you," it croons in Amber's ears as she seeks a precise fix on it: "Let me give you a big hug …"

A fraction of a light-second away, Amber locks a cluster of cursors together on the signal, trains them to track its Doppler shift, and reads off the orbital elements. "Locked and loaded," she mutters. The animated purple dinosaur pirouettes and prances in the middle of her viewport, throwing a diamond-tipped swizzle stick overhead. Sarcastically: "Big hug time! I got asteroid!" Cold gas thrusters bang somewhere behind her in the interstage docking ring, prodding the cumbersome farm ship round to orient on the Barney rock. She damps her enthusiasm self-consciously, her implants hungrily sequestrating surplus neurotransmitter molecules floating around her synapses before reuptake sets in. It doesn't do to get too excited in free flight. But the impulse to spin handstands, jump and sing is still there: It's her rock, and it loves her, and she's going to bring it to life.

The workspace of Amber's room is a mass of stuff that probably doesn't belong on a spaceship. Posters of the latest Lebanese boy band bump and grind through their glam routines: Tentacular restraining straps wave from the corners of her sleeping bag, somehow accumulating a crust of dirty clothing from the air like a giant inanimate hydra. (Cleaning robots seldom dare to venture inside the teenager's bedroom.) One wall is repeatedly cycling through a simulation of the projected construction cycle of Habitat One, a big fuzzy sphere with a glowing core (that Amber is doing her bit to help create). Three or four small pastel-colored plastic kawaii dolls stalk each other across its circumference with million-kilometer strides. And her father's cat is curled up between the aircon duct and her costume locker, snoring in a high-pitched tone.

Amber yanks open the faded velour curtain that shuts her room off from the rest of the hive: "I've got it !" she shouts. "It's all mine! I rule!" It's the sixteenth rock tagged by the orphanage so far, but it's the first that she's tagged by herself, and that makes it special. She bounces off the other side of the commons, surprising one of Oscar's cane toads – which should be locked down in the farm, it's not clear how it got here – and the audio repeaters copy the incoming signal, noise-fuzzed echoes of a thousand fossilized infants' video shows.

"You're so prompt , Amber," Pierre whines when she corners him in the canteen.

"Well, yeah!" She tosses her head, barely concealing a smirk of delight at her own brilliance. She knows it isn't nice, but Mom is a long way away, and Dad and Stepmom don't care about that kind of thing. "I'm brilliant, me," she announces. "Now what about our bet?"

"Aww." Pierre thrusts his hands deep into his pockets. "But I don't have two million on me in change right now. Next cycle?"

"Huh?" She's outraged. "But we had a bet!"

"Uh, Dr. Bayes said you weren't going to make it this time, either, so I stuck my smart money in an options trade. If I take it out now, I'll take a big hit. Can you give me until cycle's end?"

"You should know better than to trust a sim , Pee." Her avatar blazes at him with early-teen contempt: Pierre hunches his shoulders under her gaze. He's only twelve, freckled, hasn't yet learned that you don't welsh on a deal. "I'll let you do it this time," she announces, "but you'll have to pay for it. I want interest."

He sighs. "What base rate are you —"

"No, your interest! Slave for a cycle!" She grins malevolently.

And his face shifts abruptly into apprehension: "As long as you don't make me clean the litter tray again. You aren't planning on doing that, are you?"

Welcome to the fourth decade. The thinking mass of the solar system now exceeds one MIPS per gram; it's still pretty dumb, but it's not dumb all over. The human population is near maximum overshoot, pushing nine billion, but its growth rate is tipping toward negative numbers, and bits of what used to be the first world are now facing a middle-aged average. Human cogitation provides about 1028 MIPS of the solar system's brainpower. The real thinking is mostly done by the halo of a thousand trillion processors that surround the meat machines with a haze of computation – individually a tenth as powerful as a human brain, collectively they're ten thousand times more powerful, and their numbers are doubling every twenty million seconds. They're up to 1033 MIPS and rising, although there's a long way to go before the solar system is fully awake.

Technologies come, technologies go, but nobody even five years ago predicted that there'd be tinned primates in orbit around Jupiter by now: A synergy of emergent industries and strange business models have kick-started the space age again, aided and abetted by the discovery of (so far undecrypted) signals from ETs. Unexpected fringe riders are developing new ecological niches on the edge of the human information space, light-minutes and light-hours from the core, as an expansion that has hung fire since the 1970s gets under way.

Amber, like most of the postindustrialists aboard the orphanage ship Ernst Sanger , is in her early teens: While their natural abilities are in many cases enhanced by germ-line genetic recombination, thanks to her mother's early ideals she has to rely on brute computational enhancements. She doesn't have a posterior parietal cortex hacked for extra short-term memory, or an anterior superior temporal gyrus tweaked for superior verbal insight, but she's grown up with neural implants that feel as natural to her as lungs or fingers. Half her wetware is running outside her skull on an array of processor nodes hooked into her brain by quantum-entangled communication channels – her own personal metacortex. These kids are mutant youth, burning bright: Not quite incomprehensible to their parents, but profoundly alien – the generation gap is as wide as the 1960s and as deep as the solar system. Their parents, born in the gutter years of the twenty-first century, grew up with white elephant shuttles and a space station that just went round and round, and computers that went beep when you pushed their buttons. The idea that Jupiter orbit was somewhere you could go was as profoundly counterintuitive as the Internet to a baby boomer.