‘A wormhole Interface,’ Luca breathed. It was like a dream of a forbidden past.

Wormholes were flaws in space and time which connected points separated by light years - or by centuries - with passages of curved space. On the scale of the invisibly small, where the mysterious effects of quantum gravity operated, spacetime was foam-like, riddled with tiny wormholes. It had taken the genius of the legendary engineer Michael Poole, more than twenty thousand years ago, to pull such a wormhole out of the foam and manipulate it to the size and shape he wanted: that is, big enough to take a spacecraft.

‘Once it must have been magnificent,’ Teel said now. ‘Poole and his followers built a wormhole network that spanned Sol system, from Earth to the outermost ice moon. At Earth itself wormhole gates of all sizes drifted across the face of the planet like sculptures.’ This evocation was surprisingly poetic. But then Teel had been brought up within the Core itself - you couldn’t get much further from Earth than that - and Luca wondered how much this trip to the home system meant to her.

But Dolo said sternly, ‘That was before the Occupation, of course. The Qax broke it all up, destroyed the Poole wormholes. But now we are building a mighty new network, a great system of arteries that runs, not just across Sol system, but all the way to the Core of the Galaxy itself. There are a thousand wormhole termini orbiting in these rings. And if we have that in the present, we don’t need dreams of the past, do we?’

Teel did not respond.

The yacht swept on, tracking the great ring system into the shadow of the planet.

Ships swarmed everywhere, pinpricks in the dark. Saturn, largest planet in the system now that Jupiter had been imploded, was used merely as a convenient gravitational mooring point for the mouths of the wormholes, tunnels through space and time. And its rings were being mined, ice and rock fragments hurled into the wormhole mouth to feed humans at remote destinations. Luca had heard mutterings in the seminaries at the steady destruction of this unique glory. In another couple of centuries, it was predicted, the ravenous wormholes would have gobbled up so much the rings would be barely visible, mere wraiths of their former selves. But, as Dolo would have remarked had Luca raised the point, if the victorious Xeelee caused the extinction of mankind, all the beauty in the universe would have no point, for there would be no human eyes to see it.

Now they were approaching a wormhole Interface. One great triangular face opened before Luca, wider and wider, until it was like a mouth that would swallow the yacht. A spark of light slid over the grey-gold translucent sheet that spanned the face, the reflected light of the yacht’s own drive.