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Free-Floating Exoplanets with Subsurface Oceans Could Sustain Life

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Tháng Mười 9, 2021
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Free-Floating Exoplanets with Subsurface Oceans Could Sustain Life
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Dr. Manasvi Lingam from the Department of Aerospace, Physics and Space Sciences at the Florida Institute of Technology and Professor Avi Loeb of Harvard University have studied how life might survive on free-floating, or rogue, planets — interstellar planetary-mass objects without a host planetary system — via oceans prevalent underneath a thick layer of ice.The cold of interstellar space would be too much for the oceans to remain entirely liquid, but Dr. Lingam and Professor Loeb believe any putative biospheres would be protected from the cold via the ice layer, and the planet’s core would heat the planet from the inside.

Underneath the ice would potentially exist Earth-like oceans that could support life.

The possibilities for rogue planets facilitating life are of deep interest to the authors as more planets are being discovered.

“For every solar system discovered, each of which contains a handful of terrestrial planets, there are approximately 30-40 rogue planets traveling in the cold expanses of interstellar space,” Dr. Lingam said.

“The nearest exoplanet to Earth is therefore expected to be one of these rogue planets.”

“We normally think of planets bound to stars, such as Mars, that could support life, but in reality, these types of life-supporting planets could just be floating out there in the vast void of space with rich biospheres.”


The next steps in the research are to do experiments on Earth to ascertain under what extreme conditions life could survive, such as low temperatures or low pressure.A way of doing this is to analyze microbes that would not need sunlight, thereby building on previous research that has conclusively shown that more microbes exist that don’t require sunlight than those that do.

Another direction that merits future research is to look at free-floating interstellar objects as they enter our Solar System and to study the planet’s conditions to see if it would facilitate life.

“Technology would have to advance by only a modest amount to make traveling to these planets — if they are in our Solar System — easier,” Dr. Lingam said.

“You might be able to get to a rogue planet in a few decades, and, rather than looking for other planets around other stars, this might be the best chance to study these planets.”

“Through a combination of gravity assists and suitable propulsion systems, you could reach the rogue planet in 20 years or so.”

“Once you have a probe on the surface, you can beam the data back and it would probably take a few months to learn what it looks like on the surface.”

The team’s paper was published in the International Journal of Astrobiology.

Danh mục: Spacex

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