Blindsight is a hard science fiction novel by Canadian writer Peter Watts, published by Tor Books in 2006. It won the Seiun Award for best translated novel and was nominated for the Hugo Award for Best Novel, the John W. Campbell Memorial Award for Best Science Fiction Novel, and the Locus Award for Best Science Fiction Novel. The story follows a crew of astronauts sent out as the third wave, following two series of probes, to investigate a trans-Neptunian Kuiper belt comet dubbed "Burns-Caulfield" that has been found to be transmitting an unidentified radio signal to an as-yet unknown destination elsewhere in the Solar System, followed by their subsequent first contact. The novel explores themes of identity, consciousness, free will, artificial intelligence, neurology, and game theory as well as evolution and biology.
Blindsight is available online under a Creative Commons license. Its sequel (or "sidequel"), Echopraxia, came out in 2014.