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Industrialization
Artificial Light or Heat
Artificial Satellites
Atmospheric Emissions
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Gravitational Waves
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Gravitational Waves
Like electromagnetic waves, gravitational waves could be used to carry information over great distances, and have the advantage of reduced scattering due to their long wavelengths. Further, unlike optical or radio communications, gravitational waves have little background noise to contend with. The disadvantage of gravitational waves, and it's a big one, is the energy and technological sophistication required to harvest them, which is presumably out of reach of all but the most advanced civilizations.
Detectability
Gravitational waves have only recently become detectable by instruments such as the Laser Interferometer Gravitational-Wave Observatory (LIGO).
Research
5-Dec-2022
Searching for Intelligent Life in Gravitational Wave Signals Part I: Present Capabilities and Future Horizons
Luke Sellers
,
Alexey Bobrick
,
Gianni Martire
,
Michael Andrews
,
Manfred Paulini
8-Jul-2021
SETI in 2020
Jason T. Wright
Acta Astronautica
14-Sep-2020
Novel Technosignatures
A. A. Jackson
,
Gregory Benford
20-Dec-2018
NASA and the Search for Technosignatures: A Report from the NASA Technosignatures Workshop
NASA Technosignatures Workshop
Searching for Intelligent Life in Gravitational Wave Signals Part I: Present Capabilities and Future Horizons
(5-Dec-2022)
SETI in 2020
(8-Jul-2021)
Acta Astronautica
Novel Technosignatures
A. A. Jackson, Gregory Benford (14-Sep-2020)
NASA and the Search for Technosignatures: A Report from the NASA Technosignatures Workshop
NASA Technosignatures Workshop Participants (20-Dec-2018)