A mass anomaly sensor was a device used to detect and track an object based on the object's density.[1] Personal-sized sensors were available.[2]

During the Idiran-Culture War, a starship-mounted sensor could detect an object with the density of a Culture Mind through over five kilometres of batholith.[1]

Anti-gravity could fool a passive sensor.[3]


  1. 1.0 1.1 Consider Phlebas, Chapter 9
  2. Consider Phlebas, Chapter 10
  3. Consider Phlebas, Chapter 11

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