More attention has been paid in orthodox circles to the idea of large-scale astroengineering works by highly advanced races, including Dyson spheres, that might be detectable over interstellar distances, and also of sentinel devices or Bracewell probes sent to search for the presence of intelligent life in the solar system.
Recently, however, a number of mainstream astrophysicists have emphasized that the Moon and Mars, in particular, may be worth scrutinizing in more detail for signs of alien artifacts given that we now have some high-resolution imagery to hand of these worlds. In 2011, Paul Davies and Robert Wagner of Arizona State University argued the case for the Moon. A year later, Jacob Haqq-Misra and Ravi Kumar Kopparapu, at Penn State, highlighted Mars as another nearby world upon which visiting extraterrestrials may have left evidence that could be visible to orbiting spacecraft.
Related category• SETI
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