Last and First Contacts (Imaginings) (6 page)

‘It’s a possibility –’

Junge held up a hand.

I stopped breathing. I clutched at my couch’s armrests, as if that was going to help.

Nothing happened. The stars continued to shine, fading gently.

‘We’re through it,’ Junge said. ‘Next destination the Big Rip, in another fifteen billion years.’ He glanced at his timers. ‘Maybe an hour.’ He turned back to his food.

‘So no Big Crunch,’ I said.

‘No Big Crunch,’ Elstead said. ‘And, please note, resident journalist, we have made our first significant cosmological discovery. Susie, I think you need to ask me the second of your big questions.’

I nodded. ‘
Why
, then? Why make this journey?’

‘Simple. To learn the answer to the most fundamental question of all: what is to become of us, in the end?’ He began to lecture me, and through me posterity. ‘Susie, when I was a kid the universe looked pretty straightforward. The dominant force was gravity: everybody agreed on that. We knew the universe had come barrelling out of the Big Bang, and gravity controlled the future. If the mass density of the universe was too high, if gravity was too strong, then the universe would reach some maximum radius and start to fall back on itself. Otherwise the universe would expand forever. Big Crunch, or endless dissipation. But that simple picture fell apart when those anomalous distant-supernova results turned up in the 1990s. And now the answer to that epochal question about the universe’s ultimate fate depends on the properties of dark energy, which are unknown.

‘In the most extreme scenario, suppose the density of the dark energy is decreasing with time. Suppose it even goes negative. If that happens it will become
attractive
, like gravity. The universal expansion will slow quickly, and then reverse. A Big Crunch, soon. But we have already descended through the most likely epoch for a dark energy crunch. In the process we’ve proven something about the properties of the dark energy too, do you see? This is an exploration not just of cosmology but of fundamental physics.’

I glanced uneasily at Junge, who quietly watched his timers. ‘And the Big Rip?’

This was predicated on a different theoretical model for dark energy, and was still more spectacular. Perhaps the dark energy could become
stronger
with time. A positive feedback effect could cut in. The final expansion would be sudden and catastrophic.

‘Five minutes to the Rip,’ Junge said.

Again I gripped my couch.

‘Now you know my objective,’ Elstead said. ‘To observe
directly
our cosmological future – to see which of many possible outcomes we must endure – and thereby, incidentally, to confirm various models of fundamental physics by direct inspection of their far-future consequences. What a goal it is! You know, I made an awful lot of money through doing awfully little. A slightly different kind of implanted cell phone, just good enough to beat out its competitors: I made billions, but it’s an achievement that will be forgotten in a century.
This
, though, will live in the imagination forever. I know people call me grandiose. But I’ve had my kids, made them all implausibly rich. What else should I spend my money on…?’

And as Elstead talked about himself we lived through the five-minute barrier, and survived a sixth minute, and a seventh. No Big Rip; more dark energy models eliminated.

I went to my cabin, and threw up all I had eaten.

The fourth day of our journey was dull by comparison. We sat on the bridge, chewing on half-cooked TV dinners, watching the show.

We were sinking into a deep future of possible cosmic outcomes. We now seemed to be faced by a set of models of the dark energy in which its density remained constant, neither growing nor falling. According to Elstead, all we could do was wait; even at the gathering rate of our descent, there were many slow processes to be worked out before the cosmos came to its next decision point.

Thus we reached a time, a hundred billion years deep, when the cosmic expansion carried other galaxies ‘beyond our cosmological horizon’, as Junge put it, their light no longer able to reach us. Our elliptical galaxy was left alone, hanging in space like a single candle in a cathedral.

It was an increasingly shabby galaxy at that. The galaxies’ merger had wasted much of the material needed to make new stars. In time, all that was left was a population of small, miserly stars, eking out their paltry stores of hydrogen. Even they were dying, of course.

I wondered about life. ‘Civilisations like our own could be rising and falling all around us and we’d never see them.’ It was true; we rushed by too quickly.

Elstead picked on that. ‘If there is life out there, do you imagine there could still be people? Even if humanity survives, could our descendants still be anything like us?’ He glanced at my crucifix, which floated in the air before my throat. ‘Are you a practicing Christian, Susie?’

‘Sort of.’ I was brought up Catholic; I attended Mass with my parents. I welcomed the social glue of the Church, and I liked to think I had an open mind about the rest. ‘You?’

He snorted. ‘No, but my parents were, as you can tell from my first name. Consider this. In our day Christianity was only,
only
, a couple of thousands of years old. Some gods have been around longer – but many more have been forgotten. We have no idea to what gods Stonehenge was dedicated, for example. Human culture seems incapable of keeping its gods alive for more than a few millennia.

‘But suppose humanity survives a million years – or ten million. Most mammalian species go extinct on such timescales. How will time change mankind? Is it even conceivable that the memory of any god could survive such a stupendous interval? Because that’s what you have to believe, you see, if you follow Christ, or Allah, a One True God.’

I thought about that. ‘Either possibility – the abandonment of Christianity, or its enduring for a million years – is hard to get my head around.’

‘Yes, it is. But go even further. What happens if humanity goes extinct? Could the last man baptise an octopoid creature from Alpha Centauri? Can the flame be kept alive in alien heads? And what happens if intelligence fails altogether? Is there room for Christ in a universe altogether without mind, even without life? Because that is what you
must
believe. Or if you can’t believe it, then what is the purpose of your faith?…’

He went on in this hectoring way for some time. Junge shot me sympathetic glances, but I wasn’t troubled; my residual faith isn’t deep enough for that.

Anyhow I understood that Elstead was just picking on me because he was bored by this long day – bored, as he waited for the end of the universe.

On the fifth day the stars went out.

For a while the sky was full of their remains. There were black holes and neutron stars, the remnants of giants, while stars like our sun became white dwarfs, slowly fading to black. Occasionally a flare would light up the dark, as an unlucky dead star fell into a black hole, or dwarfs collided and ignited. But these were rare, chance events. Junge said that in the end our sun would collapse to a single, immense crystal of carbon, a diamond cool enough to touch. It was a wonderful image, but we weren’t able to see it.

On the sixth day we watched the galaxy disintegrate. Chance encounters threw one star after another out of the galaxy’s gravity well, a relentless evaporation that turned our black sky even blacker. Junge said that the galaxy was dispersed utterly after some hundred billion
billion
years.

That long day I spent some time trying to make such numbers meaningful. Such was the expansion of scales that as a single year was to the lifetime of the universe in my day, so the entire epoch from Big Bang to humans was to this new age. But any such comparisons, fleetingly grasped, were soon overwhelmed by our continued plummeting into ever more outlandish depths of time.

And still the expansion continued, still the universe’s dreary physical processes unfolded. There was no sound in the Bathyscaphe but our own breathing and the whir of the air scrubbers.

On the seventh day the ghosts of the last stars, mere infra-red traces, faded out one by one. The cosmic expansion, having long ago separated galaxies from each other, now plunged its hands deep into stellar neighbourhoods. There came a point when the remnant of the sun was left isolated within its cosmological horizon: the sun, alone in its own universe.

And as the day wore on, even the diamond sun began to break up.

Junge had a set of particle detectors mounted on the hull of the Bathyscaphe. He passed their signals through a speaker, and we heard soft pings from the cosmic dark.

‘Protons,’ Elstead breathed. ‘The decay of protons into their constituent quarks – on the very longest of terms, even solid matter is unstable. Another theory vindicated! They ought to give me the Nobel Prize for this.’

‘So what happens now?’

‘That all depends, Susie. On what we find tomorrow.’

None of us went to bed that night. We brought blankets from the cabins and sat in our couches, side by side, the only light in the universe shining on our faces. Nobody slept, I don’t think. Yet nobody had the nerve to suggest that we shut off the softscreens and exclude that terrible, unending night. I watched the clock. There wasn’t anything else to do.

At last, the eighth day began.

At the time we understood nothing of what happened to us. Later we reconstructed it as best we could.

We stayed together that night because we thought we were alone in the universe. We were wrong. Humans had never been alone.

From a hundred centres, life and mind spread across the face of the Galaxy. Gaudy empires sprawled; hideous wars were fought; glittering civilisations rose and fell. Yet what survived each fire was stronger than what had gone before.

Humanity, born early, did not survive to participate in this adventure. But the wreckage of Earth was discovered; humans were remembered.

Then came the collision with Andromeda, a ship of stars carrying its own freight of history and civilisation. The vast disruption inflicted deep wounds on two galactic cultures – wounds made worse by the wars of the dark days that followed.

Yet out of these conflicts came a new mixing. Minds rose up from the swarming stars like birds from a shaken tree, and then flocked into a culture stronger and more brilliant than those which had preceded it – but a more sober one.

In the long ages that followed, civilisation turned from conquest to consolidation, from acquisition to preservation. Vast libraries were constructed, and knowledge was guarded fiercely.

But the universe wound down.

As the galaxy evaporated, its unified culture disintegrated into fiefdoms. Worse, as the stars receded from each other, the universe shed its complexity, and it became impossible for the ancient catalogues to be maintained. Information was lost, whole histories deleted.

Nobody even noticed when the last traces of humanity were expunged.

The last cultures pooled resources and eventually identities, so that, within the cosmological horizon of the sun, in the end there was only a single consciousness, a single point of awareness, hoarding a meagre store of memory.

And still the universe congealed. Elstead’s final cosmological discovery was that there could be no relief from the relentless expansion. The proton decay reduced all matter to a cloud of photons, electrons, positrons and neutrinos – and at last the cosmic expansion would draw apart even these remnants. In the end, each
particle
would be alone within its own cosmological horizon. And at that point, when no complexity of any kind was possible, consciousness would cease at last.

Think of it! There you lie, the last solar mind, trapped in spacetime like a human immersed in thickening ice. Dimly you remember what you once were, how you cupped stars in your hands. Now you can barely move. And the constant expansion of the universe bit by bit shreds your memories, your very identity, a process that can only end in utter oblivion. You have nothing left but resentment and bitterness, and envy for those who went before you.

And yet there is, just occasionally, a moment of relief.

In Earth’s oceans, life teemed close to the surface, where green plankton grew thick on sunlight, a minuscule forest that underpinned food chains. But as one fish ate another, scraps or droppings would fall into the deeper dark beneath. Here swam strange fish of the deep, with huge mouths and enlarged eyes and viper-like teeth. There were whole pallid ecologies down here, surviving on the half-digested morsels that rained down from the shell of sunlit richness above.

So it was in the ocean of time. In the bright, energy-rich ages of the past, time travel had been invented and reinvented many times. And wary travellers would venture into the far future, beyond the death of the suns …

You are trapped in the cold and the dark. But, just occasionally, a morsel from the bright warm past falls down the ages to you, bringing with it a freight of mass and energy and, above all, complexity. Just for a while, you can live again – or at least, allow yourself the luxury of completing a thought.

Elstead’s Bathyscaphe, this unwary time machine, is like a fresh strawberry in the mouth of a starving man. You bite. And yet the taste is bitter …

The Bathysphere rolled and shuddered. The walls lit up with red alert signals. Junge and Elstead were shouting at each other. It was far worse than the gravity-wave wash of the galactic collision.

But it wasn’t the condition of the ship that concerned me, but the state of my own head.

I could
feel
it in me, another awareness, like a hand rummaging inside my skull. It fed on my memories, my personality, my life – it tried to consume all I had. And at the same time I sensed
it
, a huge intelligence towering over me, a roomy mind like an abandoned museum, and as desolate. I sensed envy. I sensed pity. I sensed
regret
. I wept, for myself, and for it.