The Sunborn by Gregory Benford

I look forward to the conclusion as this book is to short, ending way to soon. This continues the characters from The Martian Race with humans off to Pluto and finding life there. I do not want to say much more and chance spoiling anything for the reader. I can understand why some found it less than enthralling but I found the ideas, aliens and storyline drew me in, pulled me along and left me wanting the next book now. So if you want a hard SF to enjoy give this a try.