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Scientist says interstellar travel might be possible without spaceships – Daily Elevated News

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June 5, 2022

Scientist says interstellar travel might be possible without spaceships

While a warp drive almost certainly isn’t a thing that will ever exist, there’s no law of physics that says interstellar travel isn’t possible. Perhaps that is one reason why the sci-fi idea isn’t out of the realm of possibility, and why some scientists aren’t afraid to seriously contemplate how such a thing might work.

This article first appeared in Salon.

Enter a new research article in the International Journal of Astrobiology, in which author Irina Romanovskaya, a professor of Physics and Astronomy at Houston Community College, proposes extraterrestrial civilizations could already be doing this in a peculiar way. Indeed, Romanovskaya says that interstellar travel would likely create technosignatures — such as radio waves, industrial pollution, light pollution, or anything that would suggest advanced technology is being used — when aliens engage in such travel.

Astronomers and astrophysicists have generally searched for extraterrestrial life by looking for biosignatures — such as water, oxygen or chlorophyll — on other planets. But interestingly, Romanovskaya proposes that interstellar travel might be happening via free-floating planets, not spaceships, like we see in the movies.

RELATED: Are we looking for aliens all wrong?

“Some extraterrestrial civilizations may migrate from their home planetary systems to other planetary systems,” Romanovskaya writes. “They would most likely encounter serious or insurmountable technical problems when using spacecraft to transport large populations over interstellar distances.”

“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.”

Essentially, Romanovskaya thinks that aliens could be “cosmic hitchhikers” by taking advantage of various flyby events via free-floating planets. Unlike Earth, free-floating planets are not gravitationally bound to their stars like Earth, hence making them more mobile. A study published in the journal Nature Astronomy found at least 70 nomad exoplanets in our galaxy, suggesting that they’re not as rare as scientists previously thought. It’s possible that these planets have liquid oceans under thick layers and some could even host simple life forms.

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“Some advanced civilizations may send their populations or technologies to other stars during flyby events, some advanced civilizations may build stellar engines and some advanced civilizations may use free-floating planets as interstellar transportation to relocate their populations to other planetary systems,” Romanovskaya wrote. “Various methods of interstellar migration and interstellar colonization may contribute to propagation of advanced extraterrestrial civilizations in the Galaxy, and each method of interstellar migration can produce a set of observable technosignatures.”

OK, but how exactly would alien civilizations use these planets to travel through the galaxy?

“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,” Romanovskaya said. “That would also prepare them for colonization of oceans in planetary systems.”

Not everyone in the astrophysics world agrees that hitching a ride on lost planets is a viable method of interstellar transit. Avi Loeb, the former chair of the astronomy department at Harvard University, told Salon that he saw “no obvious benefit to using a free floating planet instead of a spacecraft.” Loeb has previously argued that a rare interstellar object, called ‘Oumuamua, bore almost all of the traits one might expect of an interstellar alien probe when it whizzed through our solar system in 2017.

“The only reason Earth is comfortable for ‘life as we know it’ is because it is warmed by the Sun,” Loeb said. “But a free floating planet is not attached to a star, and its surface would naturally be frozen.”

Moreover, Loeb said a free-floating planet’s large mass would make it more difficult to navigate to a desired destination.

“It is much easier to design a small spacecraft that offers the ideal habitat, engine and navigation system,” Loeb said. “It is far better to own a car than to hitchhike.”

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