Reader's Room features the week's most thought-provoking speculative fiction and nonfiction. This week I talk about how astronauts see Earth, when and why to quit something in the middle, and Alistair Reynold's latest.

Show links:

• Jack Fisher's Tweet, wondering, from space.
• Alistair Reynolds' The Iron Tactician
• (Previous stories in this world are available in Zima Blue and/or The New Space Opera)
• Links
  • Locus Award Finalists.
  • Charles Stross's Atrocity Archives, on sale this week.
  • Quantum Computing For The Mildly Curious.

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