. 24/7 Space News .
Extraterrestrial civilizations may colonize the Galaxy even if they don't have starships
by Irina K. Romanovskaya
Houston TX (SPX) May 27, 2022

An artist's concept of Sedna, which is approximately three times farther away from Earth than Pluto. Sedna's estimated size is three-fourths the size of Pluto. Irina K. Romanovskaya proposes that advanced extraterrestrial civilizations may be able to convert Sedna-type objects of their planetary systems into free-floating planets. Image Credit: NASA/JPL-Caltech.

Astronomers have searched for extraterrestrial civilizations in planetary systems for sixty years, to no avail. In the paper published by International Journal of Astrobiology, Cambridge University Press, and titled "Migrating extraterrestrial civilizations and interstellar colonization: Implications for SETI and SETA," Irina K. Romanovskaya proposes that the search for extraterrestrial intelligence (SETI) may have more chances to become successful when including the search for migrating extraterrestrial civilizations.

For example, extraterrestrial civilizations may leave their home planetary systems when they face existential threats. One of the ways to do so is to ride free-floating planets. Free-floating planets can offer space and resources, as well as protection from space radiation, for very large populations embarking on interstellar travel. It is most likely technically impossible that huge starships, also called world ships, can offer the same.

Extraterrestrial civilizations may also use free-floating planets to send biological or post-biological species to survey interstellar space, stars, and planetary systems, or to establish their colonies in several planetary systems to preserve and expand their civilizations even before they face existential threats at home.

In her paper, Romanovskaya discusses how extraterrestrial civilizations may hitch a ride on free-floating planets that are trespassing through their home planetary systems, or they may ride planet-like objects ejected from their planetary systems by dying host stars. Or else, extraterrestrial civilizations may use propulsion systems and gravity assist events to convert Sedna-type Oort-cloud objects of their planetary systems into free-floating planets and ride them among the stars.

Romanovskaya points out that with little starlight reaching free-floating planets, extraterrestrials could use controlled nuclear fusion as the source of energy, and they could inhabit subsurface habitats and oceans of the free-floating planets to be protected from space radiation. That would also prepare them for colonization of oceans in planetary systems. Because free-floating planets cannot sustain their oceans forever and more exploration opportunities exist in planetary systems, extraterrestrial civilizations would ride free-floating planets to reach and colonize planets orbiting stars.

Upon their close approach to planetary systems, the extraterrestrials could transfer from their free-floating planets to selected Oort-cloud objects of the planetary systems that would carry them inwards and towards the major planets of the planetary systems. Or else, the planetary systems could capture such free-floating planets. Then, the extraterrestrials would colonize the planetary systems.

To discover extraterrestrials riding free-floating planets, Romanovskaya proposes to search for certain technosignatures - electromagnetic emissions produced by extraterrestrial technologies on the free-floating planets and in their vicinity - and, in some cases, for matching signs of terraforming in a few planetary systems potentially indicating that one civilization riding free-floating planets could colonize them.

If astronomers detect technosignatures produced on a free-floating planet without detecting the free-floating planet itself, they can misinterpret the origin of the technosignatures. For example, on August 15, 1977, astronomers detected the famous Wow! signal in the constellation Sagittarius. Forty-five years later, scientists continue hypothesizing why the signal was detected only once.

According to Romanovskaya, if extraterrestrials sent the Wow! signal from an undetected free-floating planet and the planet moved away from the line of observations, then the Wow! signal would not be detected along that line of observations again. Thus, astronomers should search for free-floating planets along the lines of observations of unusual and potentially artificial signals coming from space.

Romanovskaya proposes there may be a very small chance that over the last few billions of years, free-floating planets with extraterrestrial intelligent species may have travelled in our stellar neighborhood, and she discusses different ways to look for their artefacts in the Solar System and in the nearby planetary systems.

At present, somewhere in space, hundreds of light years away from Earth or closer than that, migrating intelligent biological species or post-biological beings with artificial intelligence may be riding free-floating planets and looking for a new home. Romanovskaya recommends that the search for such space travelers - the search for migrating extraterrestrial intelligence (SMETI) - should be part of our search for intelligent life in the Universe.

Research Report:Migrating extraterrestrial civilizations and interstellar colonization: Implications for SETI and SETA

Related Links
Houston Community College
Lands Beyond Beyond - extra solar planets - news and science
Life Beyond Earth

Thanks for being there;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.
SpaceDaily Monthly Supporter
$5+ Billed Monthly

paypal only
SpaceDaily Contributor
$5 Billed Once

credit card or paypal

Unistellar and SETI Institute expand Worldwide Citizen-Science Astronomy Network
Mountain View CA (SPX) May 26, 2022
The number of citizen scientists surveying the night sky is about to soar, thanks to grants by the Lounsbery Foundation and the Gordon and Betty Moore Foundation to Unistellar and the SETI Institute. A pioneer of New Astronomy, Unistellar is the company behind a new category of telescopes, the eVscopes, the world's most powerful and simple-to-operate smart telescopes. In just a few years, the Unistellar network of app-controlled eVscopes has become the world's largest group of citizen astronomers. ... read more

Comment using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

NASA Moon Mission Set to Break Record in Navigation Signal Test

Bill Nelson, Mark Kelly praise how ASU involves students in missions

NASA awards two contracts for next generation spacesuits

What the Voyager probes can teach humanity about immortality and legacy

Ursa Major announces new engine to replace unavailable Russian-made engines

Southern Launch receives further Government funding

Debris from Chinese rocket reenters atmosphere, mostly burning up

Upper Stage Propulsion System for future Artemis mission reaches major milestone

Perseverance Has a Pet Rock!

Perseverance now selects its own targets to zap

A steep but short climb: Sols 3491-3492

Up, Up and Away - Sols 3487-3490

China's space tracking ship departs for 100th mission

Researchers start planting space-bred seeds returned by Shenzhou-13

New cargo spacecraft being built

The beginning of a multi-spacecraft exploration in Martian space by China, the US and Europe

Satellogic launches 4 Satellites on SpaceX Transporter-5 Mission

Sidus Space selects L3Harris Mission Critical Operations Center Software for LizzieSat constellation

OneWeb satellite to be deorbited at the end of its active lifetime

Axiom Space signs MOU with Italy to expand commercial utilization of space

NASA Supports Small Business Research to power future exploration

AFRL sponsorship recipient wins NASA space manufacturing contract

ICEYE completes its largest satellite launch ever with SpaceX

Sustainable connectivity in space

Geology from 50 light-years away

Extraterrestrial civilizations may colonize the Galaxy even if they don't have starships

Close encounter more than 10,000 years ago stirred up spirals in accretion disk

Plato's cave: vacuum test for exoplanet detection

Bern flies to Jupiter

Gemini North Telescope Helps Explain Why Uranus and Neptune Are Different Colors

Traveling to the centre of planet Uranus

Juno captures moon shadow on Jupiter

The content herein, unless otherwise known to be public domain, are Copyright 1995-2024 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. General Data Protection Regulation (GDPR) Statement Our advertisers use various cookies and the like to deliver the best ad banner available at one time. All network advertising suppliers have GDPR policies (Legitimate Interest) that conform with EU regulations for data collection. By using our websites you consent to cookie based advertising. If you do not agree with this then you must stop using the websites from May 25, 2018. Privacy Statement. Additional information can be found here at About Us.