But now, six billion kilometers to stern, Mission Control turns off the tap and leaves us coasting. The comet swells in our sights, a frozen enigma sweeping its signal across the sky like a lighthouse beam. We bring rudimentary senses to bear and stare it down on a thousand wavelengths.
We've lived for this moment.
We see an erratic wobble that speaks of recent collisions. We see scars—smooth icy expanses where once-acned skin has liquefied and refrozen, far too recently for the insignificant sun at our backs to be any kind of suspect.
We see an astronomical impossibility: a comet with a heart of refined iron.
Burns-Caufield sings as we glide past. Not to us; it ignores our passage as it ignored our approach. It sings to someone else entirely. Perhaps we'll meet that audience some day. Perhaps they're waiting in the desolate wastelands ahead of us. Mission Control flips us onto our backs, keeps us fixed on target past any realistic hope of acquisition. They send last-ditch instructions, squeeze our fading signals for every last bit among the static. I can sense their frustration, their reluctance to let us go; once or twice, we're even asked if some judicious mix of thrust and gravity might let us linger here a bit longer.
But deceleration is for pansies. We're headed for the stars.
Bye, Burnsie. Bye, Mission Control. Bye, Sol.
See you at heat death.
* * *Warily, we close on target.
There are three of us in the second wave—slower than our predecessors, yes, but still so much faster than anything flesh-constrained. We are weighed down by payloads which make us virtually omniscient. We see on every wavelength, from radio to string. Our autonomous microprobes measure everything our masters anticipated; tiny onboard assembly lines can build tools from the atoms up, to assess the things they did not. Atoms, scavenged from where we are, join with ions beamed from where we were: thrust and materiel accumulate in our bellies.