Gravitational Wave SETI

TL;DR

Communication through gravitational waves could allow for long-distance intergalactic communication, but it would be incredibly expensive and require advanced technology.

Transcript

Given monday's announcement of the gravitational wave detection of a pair of colliding neutron stars, I thought it might be fitting to tackle a topic that lies on the absolute fringes of the search for extraterrestrial communications. As with any form of SETI, this one has advantages and disadvantages, depending on your point of view and the circum... Read More

Key Insights

• 👋 Gravitational waves have the potential to facilitate long-distance intergalactic communication due to their ability to bypass interference.
• 😒 However, the use of gravitational waves for communication would require advanced technology and a civilization capable of orchestrating black hole collisions.
• 〽️ The absence of evidence for Type III civilizations, which could theoretically alter entire galaxies, suggests that intelligence may be rare or unable to develop into civilizations.
• 👋 Communication through gravitational waves would be an incredibly expensive endeavor, limiting its practicality.
• 😒 The Fermi Paradox remains unresolved, and the potential use of gravitational waves as a form of intergalactic communication is speculative and thought-provoking.
• 👋 The speed of propagation for gravitational waves means that civilizations would have to wait for an extended period, possibly trillions of years, for a response.

Questions & Answers

Q: What are the advantages of using gravitational waves for intergalactic communication?

Gravitational waves can travel long distances without interference, passing through solid objects like planets or galaxies.

Q: Why is communication through gravitational waves unlikely to be used by civilizations?

It would require a civilization to possess advanced technology, such as the ability to slam black holes together, which is extremely expensive.

Q: How does the Fermi Paradox connect with the potential use of gravitational waves for communication?

The absence of evidence for advanced civilizations altering galaxies suggests that advanced intelligence may be rare or unable to develop into civilizations.

Q: How long would it take for a civilization to receive a response through gravitational wave communication?

The speed of gravity propagation means that civilizations would have to wait millions or billions of years for a response, if it ever comes.

Summary & Key Takeaways

• Gravitational waves, like electromagnetic waves, can propagate at the speed of light but are not subject to interference, allowing for potential long-distance communication.

• However, gravitational wave communication would require a civilization to slam black holes together, making it an expensive and complex undertaking.

• The Fermi Paradox, which questions the absence of evidence for advanced civilizations, could be explained if intelligence is rare or unable to develop into civilizations.