66
The oldest continents in the Milky Way may be 5 billion years older than Earth's
(www.livescience.com)
This feels like a 'no duh' situation.
this post was submitted on 09 Nov 2023
66 points (94.6% liked)
Space
8874 readers
27 users here now
Share & discuss informative content on: Astrophysics, Cosmology, Space Exploration, Planetary Science and Astrobiology.
Rules
- Be respectful and inclusive.
- No harassment, hate speech, or trolling.
- Engage in constructive discussions.
- Share relevant content.
- Follow guidelines and moderators' instructions.
- Use appropriate language and tone.
- Report violations.
- Foster a continuous learning environment.
Picture of the Day
The Busy Center of the Lagoon Nebula
Related Communities
π Science
- [email protected]
- [email protected]
- [email protected]
- [email protected]
- [email protected]
- [email protected]
- [email protected]
- [email protected]
- [email protected]
π Engineering
π Art and Photography
Other Cool Links
founded 2 years ago
MODERATORS
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.
Eh, there are enough possible reasons for a civilization to not expand infinitely or voluntarily declare certain systems off limits that I don't think it's crazy to speculate that they might be, or at least may have been out there.
It could be they're very conservation-minded and set up reserves around any systems with planets that harbor life (UFOs are the assholes that jump wildlife reservation fences to hunt endangered species).
It could be they killed each other to death.
It could be they didn't exist at all.
It could be that earth was originally destined to be barren but they seeded the world to ensure it wouldn't be.
Maybe the meteor that deleted the dinos wasn't a freak physics accident.
Who knows?
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?
Interstellar travel is absolutely possible, the Voyager probes are currently doing it. You're thinking about faster-than-light travel, which is one of those, "technically not possible unless you tweak physics a little in this direction or assume the presence of unproven matter in that direction" kinda deals. Could be possible, but any way of exceeding the speed of light in any way, shape or form is indeed questionable science at best.
That said I'm a firm believer that ftl is possible and we're probably closer to it than anyone thinks because the actual solution is going to be painfully obvious but only in hindsight.
That is a lifeless, borderline non functional hunk of metal we hurled into space. That's not travel, really. It will take 40000 before it comes within 1.6 light years of another solar system.
FTL hinges on the theory that space is 4th dimensional and curved. If that can be proven, then it is possible, but without that, we're stuck here
Interstellar travel is still interstellar travel. Not sure why a hunk of metal is all that different than a generational colony ship. Additionally, we could absolutely launch a colony ship within like, 10-15yrs if humanity decided to band together and actually give a shit about space again. A nuclear drive would theoretically allow humans to reach our nearest stellar neighbors within a human lifetime, and we already know how to build those. We also already kinda have all the pieces we'd need for a self-sustaining ship, we just have to put them all together. The biggest hurdle would honestly just be getting it into orbit and keeping the crew entertained and healthy for the trip.
"Several exoplanets at the edge of our galaxy could have formed continents β and advanced life β 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 π
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.
The ego on this lad tho. Imagine thinking we're "advanced". Bitch, we still can't get our species to universally agree that slavery is bad, what do you mean "even more advanced than our own."
I kinda doubt the writer meant for people to read it like that, but damn, what a sentence.