Relative Likelihood of Success in the Search for Primitive versus Intelligent Extraterrestrial Life.

@article{Lingam2018RelativeLO,
  title={Relative Likelihood of Success in the Search for Primitive versus Intelligent Extraterrestrial Life.},
  author={Manasvi Lingam and Abraham Loeb},
  journal={Astrobiology},
  year={2018},
  volume={19 1},
  pages={
          28-39
        }
}
We estimate the relative likelihood of success in the searches for primitive versus intelligent life on other planets. Taking into account the larger search volume for detectable artificial electromagnetic signals, we conclude that both searches should be performed concurrently, albeit with significantly more funding dedicated to primitive life. Based on the current federal funding allocated to the search for biosignatures, our analysis suggests that the search for extraterrestrial intelligence… 

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References

SHOWING 1-10 OF 155 REFERENCES

The search for extraterrestrial intelligence

It is now possible to put limits on the existence of ETCs of varying capabilities, within arbitrary distances from the Solar System, and conceive of real-world strategies whereby the authors might communicate with E TCs, or they with us.

On the likelihood of non-terrestrial artifacts in the Solar System

The detection of extra-terrestrial life and the consequences for science and society

  • M. DominikJ. Zarnecki
  • Physics
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2011
A Discussion Meeting held at the Royal Society in London, on 25–26 January 2010, addressed not only the scientific but also the societal agenda, with presentations covering a large diversity of topics.

Alien Mindscapes—A Perspective on the Search for Extraterrestrial Intelligence

This approach will augment the odds of detecting a signal by broadening the understanding of the evolutionary and systemic components in the search for extraterrestrial intelligence (ETI), provide more targets for radio and optical SETI, and identify new ways of decoding and coding messages using universal markers.

Enhanced interplanetary panspermia in the TRAPPIST-1 system

  • M. LingamA. Loeb
  • Physics, Geology
    Proceedings of the National Academy of Sciences
  • 2017
A simple model for estimating the probability of interplanetary panspermia in the recently discovered system of seven planets orbiting the ultracool dwarf star TRAPPIST-1 is presented and it is found that panspermIA is potentially orders of magnitude more likely to occur in the TRAPPist-1 system compared with the Earth-to-Mars case.

Colloquium: Physical constraints for the evolution of life on exoplanets

Since the 1990s over 4000 exoplanets have been discovered: which of them could also develop and harbor life? It is posited that the planet must have liquid water, a surrounding atmosphere, and must

A search for life on Earth from the Galileo spacecraft

In its December 1990 fly-by of Earth, the Galileo spacecraft found evidence of abundant gaseous oxygen, a widely distributed surface pigment with a sharp absorption edge in the red part of the

The Search for Extraterrestrial Intelligence (SETI)

▪ Abstract The search for evidence of extraterrestrial intelligence is placed in the broader astronomical context of the search for extrasolar planets and biomarkers of primitive life elsewhere in ...

Optimal Target Stars in the Search for Life

The selection of optimal targets in the search for life represents a highly important strategic issue. In this Letter, we evaluate the benefits of searching for life around a potentially habitable

The astrobiological case for our cosmic ancestry

Abstract With steadily mounting evidence that points to a cosmic origin of terrestrial life, a cultural barrier prevails against admitting that such a connection exists. Astronomy continues to reveal
...