|Alien base on Triton far-side|
I had had no choice – orders! – but I wondered how my colleagues would take it when they found out. I had an awkward feeling about that, like a small nagging toothache but more in the region of my guts. The feeling puzzled me: was it in anticipation of a difficult moment to come? Or could it be guilt? I couldn't figure it so set it aside: there was stuff to do. Once Wallax had approved Vine’s plan he saw no advantage in delay. The show was about to begin.
Marcus, Tina and I had rejoined Thrust, now in orbit around Neptune. Wallax’s Constellation still had the gas giant prudently interposed between itself and Triton. Further round in the orbital plane, we could see both Constellation and the moon where the aliens were still mysteriously emplaced on the far side. We were about one and a half light seconds from each of them.
We had been very, very cautious in our battle plan – ascribing to the enemy the ability to successfully disable anything we put up in their view. We intended an invasive reconnaissance: a close look at what we were dealing with .. which would also conclude with their complete destruction. Our strategy would admit no countermeasures at all.
Thrust’s command centre was a relatively small, open area placed at the ship’s centre of mass, minimising the effects of spinning the vessel in combat. At one end was a large screen, where computed projections of the battle space were displayed - I could do considerably better of course, through my direct cortical links.
Vine was seated at his console to my left with Marcus on his other side. I noticed Tina at one of the ‘hot desks’ at the back. She looked diminished somehow, and was staring determinedly at the screen.
I felt that gnawing feeling more strongly now. Once things started up, it was impossible to know how events would unfold. This could literally be the last few minutes of my life! I looked around: no-one else seemed as concerned. Vine caught my eye and smiled – a hard smile. He seemed to be having the time of his life. I really couldn't figure him out, didn't he realise how badly this could turn out? I put it down to lack of imagination.
The first overt sign that the operation had started came as a firework detonated on the screen, orbitally forward of Triton. In my machine-augmented mind I could see the dense shell of tiny tungsten ball-bearings expanding from a point. The event had been carefully calculated: in a few minutes, Triton’s orbital path would puncture the ever-growing shell we had created, and some minutes later the moon would find itself momentarily at the centre of a spherical surface composed of tiny, shiny balls of the most refractory metal known.
These motes of tungsten were entirely passive. With no electronics, power supply or device-functionality, their only function was to reflect. With telescopic sensors on Thrust and at other similarly distant locations, we could image any electromagnetic emissions from the alien outpost, either active or involuntary, across the spectrum.
Even if our opponents used high-powered beam weapons to try to clear the cloud, it was so vast and so refractory that success could not come rapidly. And we only needed it for twelve minutes.
The next phase of the plan required even more exquisite timing. Imagine a tangent line to Triton brushing the moon’s surface ever-so-lightly at the aliens’ exact location. Extend it in both directions around one million km. At one end place a Terawatt gamma ray laser battery, at the other a gamma ray telescope array.
Now, a small correction: put both the laser and telescope on trajectories where they’re below Triton's horizon as seen from the enemy base. They’re rising slowly, led by the laser battery. The plan is wholly driven by the speed of light.
Sat in my body-hugging command chair, visualising a dynamic 3D near-space model in real-time mode, I watch the clock tick down to t = zero.
The laser battery icon intersects the tangent line (the detector hasn't quite got there yet). A thin blue line emerges from the battery. This is all computed – Thrust can’t ‘see’ faster than the speed of light and in any case most of the action - from our vantage point - will be occurring behind Triton itself. The gamma beam crawls across space at this scale – physics assures us that the aliens can neither see it nor the laser battery yet. The first they'll know will be when the beam strikes.
I check the beam attributes. It’s lensed to focus down to as near a point source as diffraction allows at the target. The straightness of the line is an illusion: in reality the spatial position will be rastered along an X-Y grid normal to the beam for total target illumination hundreds of times per second. At this stage the power is relatively low, we seek information not destruction. But that won’t last.
Three seconds have gone by and the beam has now encountered the alien base. If they could see gamma rays, and maybe they can, it would seem to them that a supernova has gone off exactly on their horizon – a brilliant point source flickering hundreds of times per second.
And now I visualise the detector sliding into position at the other end of the tangent line, just in time to pick up those gamma rays which scattered through the target, giving us an ‘x-ray movie’. Other detectors, out of sight of the enemy base, are viewing the scene from reflections off our convenient tungsten mote-cloud.
It is hard to see what the aliens can do about this. Our devices are more than three light seconds away and moving in a complex choreography which keeps them aligned, but makes their positions impossibly difficult to predict and target.
Four seconds into the mission and there has been no time for any real telemetry to get to Thrust, everything is still simulation. If the aliens had even the fastest contingency plans, it’s getting way too late. They have been under gamma illumination for just over one second and those Terawatts are beginning to crank up. The plan calls for an exponential power ramp to full capacity of the laser battery in three seconds. This is to allow time for the telescope to track weapon effects and then deploy filters to avoid its own complete destruction.
What is the best the aliens could do? We asked ourselves that a hundred times and ran many simulations. The only tactic which had a chance of working was a reflex screen deployment: somehow block or reflect the incident radiation. It takes metres of heavy nuclear materials to absorb gamma radiation, and while you were doing that you would probably be quite preoccupied, so we had one last surprise.
I checked my simulation and there it was. Compared with the gamma wave-front, this was slow-moving indeed, but it had a lot longer to travel. We had launched the fusion weapon hours ago: it had now reached Triton, on a curving grazing trajectory which would momentary bring it over the alien base at around 1,000 metres altitude. It was travelling at 300 kilometres per second.
The simulated flash on the screen surely didn't do justice to the reality: a multi-megaton blast optimised for neutron radiation (and of course a very hard gamma pulse) which by now must have already occurred. The enormous forward momentum of the missile would ensure that most of its debris would miss the ground and indeed exit the system. We wanted the base in tiny non-functional pieces, but retrieving those pieces was the kind of exploratory reconnaissance Vine had always had in mind.
At t plus six seconds the final act of our destructive play unfolded. Hidden by terrain from our cataclysmic thermonuclear vandalism, a hardened drone lifted out of a nitrogen ice trench and ferried a full surveillance suite towards the hopefully now ex-base. We waited the minutes it would take before we got our first view on the ground.
Ⓒ Nigel Seel, March 2015.
This is a fragment: maybe one day I'll complete it. If you liked this you might take a look at Phytocide, True Romance and Dave Declares.