Edge of Infinity is not especially concerned about Earth, but it cares deeply about humanity. It’s not blindly optimistic, but neither is it depressingly morbid. It cares about the little things and the big, it’s got romance and death, and lots and lots of adventure, set within our solar system but not on Earth. Also, space ships.

Pat Cadigan opens the anthology and immediately throws the reader into the position of deciding whether they can hack the displacement. “Nine decs into her second hitch, Fry hit a berg in the Main ring and broke her leg.” This, accompanied by the story’s title – “The Girl-Thing Who Went Out for Sushi” – is a very clear sign that Here Be Science Fiction; the sort of science fiction that requires the reader to do a bit of work, while trusting in the author that these things really will make sense. And, of course, they do; Cadigan is a marvellous writer who mixes the very weird with the quite familiar, and gently leads the reader to understanding where she’s going with her story. The unfamiliar language is used partly to warn the reader that this is not a situation they can just take for granted, but also because it’s entirely appropriate that language would change out there around the moons of Jupiter – perhaps especially, as in this case, when those living in an alien-to-humanity environment have themselves changed from the human standard, at least morphologically. Cadigan also makes some interesting points about how being “two-steppers” has impacted on humanity’s ways of thinking, especially with regard to binary decision making. At heart, this story is about choice: an individual’s freedom to make choices about their body and their livelihood and where they live. Just suggested in the background is also a broader discussion about political choice, too, with shades of James SA Corey’s Leviathan Wakes and Caliban’s War, about the place of Jupiter in the solar system. It’s a fitting opening to the anthology, flagging as it does many of the issues that resonate across the set.

Elizabeth Bear’s”The Deeps of the Sky,” which comes next, is the only story that focusses on aliens. Here again though the focus is on choice; Stormchases and his skiff have been out mining a storm for trace elements such as iron when a curious object appears in the sky, and he has to decide what to do about it. The plot is thus quite straightforward, but it’s the world building that makes this story an interesting one. As mentioned, it focusses on an alien society – probably living in Jupiter – and aside from the alien biology, the aspect Bear gives most attention is that of reproduction. Who gets to reproduce and with whom, and at what cost (…literally) is absorbing Stormchases, and therefore the narrative. And it is indeed different enough to cast a rather fascinating light on humanity’s own tendencies in those realms.

Bringing the anthology back closer to home (… again, literally) is James SA Corey’s “Drive”, a story that unfolds along two different temporal tracks: in one, Solomon has just taken off from Mars in his souped-up space craft; the other follows Solomon from his first encounter with Caitlin and their subsequent relationship. Like Cadigan, Corey envisages a solar system that is as uneasy with differentials in political power as it is with access to, and production of, resources. This provides much more of the narrative tension for Corey than it did for Cadigan; Earth’s attitude to Mars has an immediate impact on Solomon and his life. I’m excited to see stories like this one, despite its melancholy tone, because it puts the idea of colonising Mars squarely back into the realm of the possible, at least from an SF perspective. There’s no suggestion that it will be easy – quite the contrary – but at least humanity is there, reaching beyond our own troposphere. Somehow the idea of being out on Europa or Titan isn’t quite the same, even though the colonisation of Mars is generally a prerequisite of that further expansion.

Sandra McDonald and Stephen D Covey deliver “The Road to NPS,” similar to “Drive” in that it focusses on the issue of transportation – bringing to mind Samuel Delaney’s Nova, and the suggestion that once a civilisation expand beyond the solar system, transportation becomes the most important issue. For Rahiti, this presents a challenge he cannot leave alone – despite the threat, and very real danger, inherent in doing so. Rahiti is one of few antagonists of this anthology that I did not particularly connect to. I think this is partly because his motivation seemed to be entirely commercial – which isn’t necessarily a bad thing, it simply did not work for me. And he just didn’t seem like that nice a guy, overall.

The first AIs turn up in John Barnes’ “Swift as a Dream and Fleeting as a Sigh,” where, intriguingly, AIs are therapists. For humans. Which is about the most unlikely role I’ve ever read them in. This is one of the most complex stories of the anthology, narratively speaking. The “I” is the AI, and the narrative follows multiple threads. First, and appearing sporadically throughout, is the narrator’s own musings on its own capabilities – specifically the difference in subjective time that it and its human interlocutors experience. It draws a comparison for one of the humans: that “the ratio of [its] cycles of information processing per second to theirs is about the same as theirs to an oak.” In response to which, very sensibly, the human (eventually) asks what an oak would think about… which doesn’t seem to be the point, but perhaps from the AI’s point it is. Anyway, the story is a fascinating glimpse into what that sort of processing power might do (brain the size of a planet, and so on). The rest of the narrative involves the AI musing on its interactions with two humans it has counselled. Laura and Tyward see the AI for different reasons – Laura because of Ty, Ty because of an ant (a mechanical one). Their relationship, shown through the AI’s interactions with them as individuals, is poignant and realistic, even though I think the conclusion is a bit of a stretch. Finally, I’d like to point out how hard it was to write this without referring to the AI as ‘he’. I think this was because its character came across so strongly, and as humanly flawed rather than a remote perfect artefact, that it seemed wrong for it to be genderless. As for ‘he’ – well, yes. Aren’t all robots male? (sigh)

Paul McAuley’s “Macy Minnot’s Last Christmas on Dione, Ring Racing, Fiddler’s Green, the Potter’s Garden” wins for longest title. It, as a title, also covers the most important things that Mai Kumal learns about when she travels to Dione, one of Saturn’s moons, on the occasion of her father’s death there. Overall this is a less a narrative, really, than a rumination on what humanity might do Out There, so far away from the safe little blue ball. Colonisation; extreme adventure sports; secretive colonisation; and outrageous, lavish works of art. This is definitely one of the more overtly optimistic pieces of the anthology. While it’s a bit sad that Mai and her father were estranged, this is set against a glorious back drop of humanity’s potential, both in terms of relationships and Grand Achievements. And I think it’s a wonderful dream, for that.

Taking quite a different tack, one of the narratively most straightforward stories is “Safety Tests.” Here, Kristine Kathryn Rusch takes a very normal, albeit still dangerous and necessary aspect of humanity + machinery – the idea of needing a licence – and explores it. In space. Using spaceships. Around an inhabited space station. Over the course of a single day, Devlin must deal with six quite different applicants for public piloting licences. Things progress from there about as Devlin appears to expect every day to progress. That is, poorly. There’s not much extra world building built into this story, but it’s the sort of situation one can imagine fitting into most any space-faring story (imagine Ellen Ripley or Han Solo going for their licences. I dare you).

“Bricks, Sticks, Straw” is my favourite story of all, so thank you very much Gwyneth Jones. Set very briefly on Earth, the focus is on four Remote Presence devices, operated by humans on Earth but physically located on the four Galilean moons of Jupiter. Thanks to a solar storm, the link to those devices is severed, but the software agents… well. They continue to exist, and to operate, if in rather different ways from what their designers and operators would recognise. These manifestations are wonderfully thought out – how such software, designed to be intelligent and run programmes, might react to apparently being abandoned by their makers, and how they might interact after that happens. (It does make me wonder somewhat about the poor old Mars landers and rovers….) Sophie, on Callisto, is the focus of the story: she is both an array collecting data of the Jovian system; and a memory, or a remnant, or an avatar of the Sophie back on Earth. Of the four devices, she is the only one who both accepts this reality and thinks that getting back in touch with Earth is actually important. So this is the only story that does not imagine humanity having literally spread out through the solar system – yet, anyway; it’s also the story that feels temporally closest to Now. Sophie is delightfully engaging, and her concerns entirely realistic (within the bounds of the story, naturally).

Following a theme of Hannu Rajaniemi work in Jonathan Strahan anthologies (… that would be two from two, so maybe not a theme yet; the other one was “The Server and the Dragon,” in Engineering Infinity), “Tyche and the Ants” is the most magical-seeming of these stories, while – as the reader suspects throughout and has confirmed by the ending – having a very solid science fictional basis to everything; it’s the perception that lends the magic, not the action. It also comes close to the Jones story as being my favourite. Tyche lives on the moon, dividing her time between the Base, where she’s meant to stay, with only the Brain for company; and the place through the Secret Door, where waits the Magician and various other creatures. Her seemingly happy life is, however, disturbed the day the ants come to the moon. On one level this can be read as a poignant almost-fairytale; it’s sweet, if combined with some rather sad moments because of Tyche’s confusion. However, Rajaniemi does that wonderful thing of suggesting an enormous background to the story, without ever overwhelming the immediate story – and I now really want a novel set in this universe. Please. Because there are all sorts of ideas about humanity that are suggested at but not fully developed.

The main narrative thread of most of these stories so far (the Barnes is perhaps the exception) has encompassed a relatively short timeframe. Not so Stephen Baxter’s “Obelisk.” Beginning with the arrival of Wei Binglin on Mars, as he pilots the Sunflower in after a very difficult voyage, the story follows the next several decades of Binglin’s life as he adapts to Mars, deals with the brash American Bill Kendrick, and both watches Mars develop and assists in that happening. Binglin is an interesting character through which to explore this; he feels a great deal of guilt concerning the Sunflower, and he’s unconvinced, early on, about living planetside. His growth as a character works overall, and I can absolutely agree with how Baxter imagines Mars bootstrapping itself. And the fact that he imagines it as a largely Chinese endeavour is certainly believable, although there’s not a whole lot of Chinese-specific culture to be seen. However, I was troubled by the way Baxter dealt with Xue Ling, Binglin’s adopted daughter. The role she plays seems largely superfluous; certainly the apparent pull she exerts on both Binglin and Kendrick is not required to get them to do what they do. Rather she sometimes seems like an excuse. Her actions at the conclusion of the story were especially problematic, seeming not to fit in at all and feeling instead like gratuitous sentimentality on Baxter’s part, or as if there needed to be some big dramatic Thing to impart some sense of occasion to the story. It was unneeded and I think actually undercut the rest of the story.

Alastair Reynolds’ “Vainglory” is another story that uses two temporal tracks. In the first, Loti Hung is confronted by Vanya Ingvar, and asked some uncomfortable questions about her interactions with a certain Skanda Abrud; while the second is essentially Loti remembering exactly that interaction. While many of the central characters throughout this anthology have been engineer or science-y types (although not all, Tyche in Rajaniemi’s story and Mai is McAuley’s especially), Loti is quite different: she’s an artist. Specifically, a rock artist – someone who carves rock on a massive scale – we’re talking asteroids here. And I love the very idea of a science fiction story that focusses on the possibilities for art in the future, in these far-out locations humanity may find itself in (McAuley does a similar thing). The story is about one of Loti’s commissions, and it not turning out to be quite what she thought; and Ingvar investigating just exactly went on with it. The interaction between the two women is understated and believable, as is that between Loti and Skanda. Again, this quite personal story is set against a much larger backdrop of solar system colonisation, the arrogance of wealth, and questions of justice.

While transportation may be one of the major issues of solar system colonisation, as shown in “Drive” and ” The Road to NPS,” solar system habitation is going to be greatly impacted by something that already affects large swathes of Earth: access to water. In “Water Rights,” by An Owomoyela, this issue is front and centre after an explosion interrupts the water supply for many of the near-Earth colonies. This is of immediate interest to Jordan Owole because, as the owner of an orbiting hydroponics outfit – which naturally has a large reservoir – she’s now become of great interest both to the authorities and to independent orbiting homesteaders. Which is an uncomfortable position to be in, to say the least. While this sounds potentially depressing, Owomoyela pulls a beautiful turn at the end which nearly brought tears to my eyes, and makes it amongst the more obviously optimistic of the anthology.

The ultimate story in this set is from Bruce Sterling, and a weird one it is. “The Peak of Eternal Light” is set on Mercury – a Mercury with incredibly restrictive and quite bizarre gender restrictions, especially when it comes to marriage. There were moments when I, as a woman, found reading this story actively unpleasant; while Sterling may not (probably does not) accept the ideas presented here as worthy, and does indeed go on to critique them to some extent, it was still not an enjoyable experience. There are a number of instances where he veers very close to existing stereotypes that, in a futuristic setting – even with outre accoutrements intended to suggest perhaps that this is new and weird – were depressing to imagine continuing beyond the confines of Earth. Marriages are entirely arranged and intended to be endured, nothing more; couples spend time with one another in strictly regimented ways, and the women appear to live in the equivalent of a harem. The central couple, who refer to each other as Mr and Mrs Peretz, do begin to question some of the limitations placed on them; and I did enjoy the idea that the bicycle, which was indeed a revolutionary form of transportation in its time for women, would find a new lease on life on Mercury. This questioning, though, did not compensate for the overall image of life on that planet. I do not want Sterling’s vision of the future.

Overall, this is an awfully good anthology. And it’s very exciting indeed to read an anthology entirely dedicated to science fiction, and science fiction of what might be called the medium term future; not the immediate collapse of Earth’s ecosystem, nor the humans-spanning-the-galaxy stories (which I do adore, I’ll be honest). It’s an anthology that spans ideas, planets, concepts, personalities and the future of humanity. What’s not to like?