
Tearing its way through space on a collision course for Earth is Nemesis, a fiery ball of destruction, a dwarf star as red as the color of blood. Circling Nemesis is Rotor, an Earth colony whose occupants have cut themselves off from the anarchy and degeneration of an old and wasted world to form their own utopian existence. For them Rotor is a kind of Ark; one with hidden dangers that must be understood.
In a kind of allergic reaction to this sort of thing, there was a movement in SF that aliens would be likely to be so different from us that we would be unlikely to even recognise them as intelligent. Stanislaw Lem's Solaris is a well known example, and the Pandora sequence by Frank Herbert was interesting. I never quite bought it though, and Nemesis by Isaac Asimov seemed to me to be a particularly lazy example that pretty much put me off the whole idea. (I'm a fan of Asimov, but this one didn't work for me).
On the one had we can look at life on earth to see the huge variety of biological forms that are possible even just on our own planet, with fundamentally the same core biology throughout. On the other hand, any life in our universe is going to be constrained by the same basic principles of chemistry, physics and emergent constraints such as thermodynamics, information theory and natural selection. The problem with most of the efforts at 'truly alien' aliens is they emphasise their alien-ness by showing them violate such principles to show how 'we don't know as much as we think we do'.
I don't buy it. Thermodynamics, natural selection, information theory, etc - we know these things. They're real constraints that any life, anywhere must contend with and they constrain what can or can't work within comprehensible limits. I'm not at all saying that genuine alien life can't be surprising, that we won't learn anything new from it. We learn new stuff form like here on earth all the time. I'm just saying we actually know a pretty decent amount about how the universe works at a basic level and this will give us a decent chance at figuring this stuff out.
That's where I am this this now, but it's a complex issue. I really need to watch Arrival though.
Not to be confused with the "Nemesis" by Clarke which is about something different apparently.