The oldest continents in our galaxy may have arisen 5 billion years before Earth’s, new research suggests — and that means there may be multiple worlds in the Milky Way harboring alien life even more advanced than our own.
Astrobiologists think a planet needs to have certain features to support life: oxygen in its atmosphere, something to shield organisms from dangerous radiation and liquid water, for a start. Although big land masses aren’t strictly necessary for living things to emerge, Earth’s history shows that they’re important for life to thrive and exist for long periods of time. So, if an exoplanet had continents before Earth, it follows that there might be older, more advanced life on that world.
This line of thought led Jane Greaves, an astronomer at Cardiff University astronomer in the U.K., to answer the question: When did the first continents appear on a planet in our galaxy? Turns out, two exoplanets’ continents — and perhaps life — may have arisen four to five billion years before Earth’s.
If life on another planet had a five-billion-year head start, it “could potentially host life more evolved than us,” Greaves wrote in a study, published in the September issue of the journal Research Notes of the American Astronomical Society.
This feels like a ‘no duh’ situation.
If we define “life” as nucleic acid based, water-containing, semi permeable enveloped organisms, then our search for ET will be futile. We should expand the definition to the broadest sense possible, i.e., “life” should be: any entity that locally collects energy from it surrounding by going against the entropic gradient and can replicate this ability to new generations of entities via an information transfer mechanism.
Well since you’d need like not even a million years to colonize the galaxy, I’d say that they didn’t
Habitable for life, and intelligent life necessarily developing are two different things.
Also 5 billion years is enough time to conquer the galaxy and go extinct multiple times over.
I guess we should still find something artificial somewhere, no? Some red star with a different colour spectrum or something
Only if intelligence is common, so far we have no reason to believe it is.
Not only that, we have very little reason to believe life exists anywhere outside the earth, other than it would be really weird if it only happened once.
Yeah we have an example with dinosaurs that didn’t develop intelligence in 100+ million years
Lots of reasons why life didn’t spread beyond a solar system, let alone colonize a galaxy. Entire civilizations more advanced than our own could have risen and fallen without us ever knowing.
This assumes that interstellar travel is even physically possible.
Nah, we’re talking generational ships sent around at 10% of speed of light
How many generations would you damn to a metal prison is space where they’re forced to labor in specific specialized roles until they die in space?
I didn’t choose to live in this prison planet and forced to work in a specialised role until I’ll die in space.
You’re right, so you’d do worse to other because it was done to you?
“Several exoplanets at the edge of our galaxy could have formed continents — and advanced life — 5 billion years earlier than Earth, new research suggests.” Immediately feelin apprehension to read this XD.
I know what a continent means on a planet.
But what does it mean when talking about space or galaxies? Is it a specific area in space or a specific amount of area (wherever) in space?.
So, if an exoplanet had continents before Earth -
I don’t understand what this means 😅
The wording was bad, for sure. It’s referring to other planets that have large bodies of land that may be surrounded by a liquid. (Do continents have to be surrounded by water or other liquid? I am too lazy to find the exact definition. It was critical in our development, for sure.)
One possible translation: If continents formed on other planets, there is potential for those planets to form similar ecosystems. Tectonic activity also suggests a planet that has a hot interior and a stable magnetic field. Since the surface of the planet is active, heavier minerals could be pushed up instead of sinking down. This could help drive more complex chemical reactions.
Continents may imply complex shorelines as well. Much of the evolution on earth was driven by the need for plants and fungi to have access to vast quantities of water, ample sunlight and a better supply of fresh air. Shorelines have everything, including places for big critters to find and eat little critters.
Continents provide diverse conditions, for sure. If they existed on other earth-like planets before ours, it could have possibly given life a huge headstart.
even more advanced than our own.
I don’t know what to say about that.
