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Two potentially life-friendly planets found orbiting a nearby star

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191–200 of 391 posts

Re: Two potentially life-friendly planets found orbiting a nearby star

#191

Earlier quoted context omitted.

Yes I agree, we seem to be working on the wrong problems or get the priorities wrong. We keep on inventing newer technologies which come with newer problems while the ship is slowly but surely sinking. Sometimes I wonder what would it take for all of us to join a concerted effort to concentrate on the real problems we have. Technologies seem to veer into an escapist route, some way for us to run away from the problem…

I think this is exactly why there's an apocalypse fantasy/fetish. It's in our psyche that we're all focused on... well... dumb shit. A post-apocalypse lifestyle makes you focus on what I think we can all truly appreciate as important. There's a lot of interesting studies done on localized disasters where the idea of community actually erupts out of it. People working together and sharing, regardless of their "social…

I have a similar experience from my childhood. I grew up under communism in eastern europe and I remember the crisis we were going through at the time, food was rationed and there were long queues everywhere. People were even joining queues without knowing what was being sold and some would start lining up overnight. I was a kid back then and didn't experience the adversity first hand but I could see and sense what was going on. Aside from these things, however, I remember how helpful and inclusive the community was. People were sharing whatever they had, whatever they cooked, recipes, anti-establishment jokes, books, video tapes, etc. There was this sense of belonging that now has dissipated completely. I was struck with a deja vu when I visited Cuba a couple of years ago. People are poor but are sane and happy in their own ways and they have time for one another. There are still disparities but not like in a western society when one counts their pennies and the other their billions. Romania, the country I grew up in, has been engulfed in corruption and asides from a cities with large concentration of wealth, everything is in disrepair, the community disappeared almost completely and everything seems to have gone downhill for the past 30 years. In no way am I decrying the communism, it was brutal to many, but what has ensued after the fact was a veneer of shiny nothing.

Re: Two potentially life-friendly planets found orbiting a nearby star

#192
I saw a study recently, unfortunately I can't locate it now.

It discussed the possibility of there having been past civilizations on Earth, hundreds of millions or even billions of years ago. The conclusion was that this can't be entirely ruled out. It noted how few actual fossil remains we have for what we know of dinosaurs, and that there's a lot of space left in those gaps for all the evidence to have been destroyed.

Re: Two potentially life-friendly planets found orbiting a nearby star

#193

Earlier quoted context omitted.

What are the chances that would've already happened given how long we've been sending life made RF off the planet? A 24 year exchange isn't awful.

12 light years is a long way for a signal to go without attenuating into noise.

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Re: Two potentially life-friendly planets found orbiting a nearby star

#194

Wouldn't planets orbiting this close to the star be tidally locked to it? If they are tidally locked to the star, they are also likely to have extreme temperature variations between the two sides. This could rule out life.

If that’s true, as it is true for planets in the TRAPPIST system, then at least there is a potential for life to develop around the thin longitudinal slices located more centrally, where climate may be more temperate.

Also see this comment below, something I wasn’t aware of: https://news.ycombinator.com/reply?id=20212953&goto=item%3Fi...

I’m curious- at the end of the article, one of the scientists remarks that the stars might be “zipping around” their host star faster than measurements predict, which could rule out potential for life. Is this referring to your suspicion re: proximity => tidal locking => extreme temperatures? Or is there some way that speed of orbit can affect potential for life?

Re: Two potentially life-friendly planets found orbiting a nearby star

#195

The trilogy _Three Body Problem_ is a good read, and has something to say about this. :)

I had high hopes, but TBP is a terrible novel. It certainly has some fascinating ideas, but just as many ludicrous ones that are equally central to the plot. Not to mention Liu is absolutely terrible at anything relating to characters: dialogue, character development, etc.

Yeah. Having read all three, they were interesting but not anything I'd re-read.

The opening of TBP had me hoping -- being a big Neal Stephenson fan -- that the whole book would involve a lot more of the historical context of the early PRC, and then it all went somewhere completely different. I strongly feel that the first bit of the book set in the past is the best part of the entire trilogy.

The idea of Chinese sci-fi in general becoming a thing is very cool though, I think.

Re: Two potentially life-friendly planets found orbiting a nearby star

#196

The trilogy _Three Body Problem_ is a good read, and has something to say about this. :)

The concept of the dark forest is pretty interesting for sure.

Do we really want to be announcing to the galaxy our presence where malevolent alien species may be present. If they have developed technologically even just a couple hundred or couple thousand years ahead of us we'd be easy pickings.

Re: Two potentially life-friendly planets found orbiting a nearby star

#197

The trilogy _Three Body Problem_ is a good read, and has something to say about this. :)

I had high hopes, but TBP is a terrible novel. It certainly has some fascinating ideas, but just as many ludicrous ones that are equally central to the plot. Not to mention Liu is absolutely terrible at anything relating to characters: dialogue, character development, etc.

Over in the s-f subreddits, this novel gets so much love. So I feel left out that I - like you few here - really hated it.

My big thing was that the science is just wrong.

Most fundamentally, it's not a three-body problem, there are (at least) four bodies: the three suns and the planet.

And the real world isn't going to follow any theoretical solution to TBP anyway. There is atmospheric drag, microscopic gravitational perturbations from the rest of the universe, decreasing solar masses as the stars age, and so forth.

In a system as chaotic as was described, any of these things make the problem intractable.

That said, I did enjoy the description of a digital computer implemented with "people" acting as the logic gates.

Re: Two potentially life-friendly planets found orbiting a nearby star

#198

"just 12 light-years away" I love the "just". I know it's nearby on galactic scales but it's practically about 450,000 Earth years away with current technology :-)

>450,000 Earth years away with current technology

With current tech spread thinly an alpha emitter like Po (2% mass ejected at 5% c) on the backplate and you’ll get 100km/s with 10% payload. Adding an electromagnetic “nozzle” to axially redirect sideway alphas would make it past 200km/s, ie. less then 20k years. Spread thinly enough for the decay leftover - Pb - to be ejected too and you can get to something like 600 km/s, just 6000 years.

Re: Two potentially life-friendly planets found orbiting a nearby star

#199

I saw a study recently, unfortunately I can't locate it now. It discussed the possibility of there having been past civilizations on Earth, hundreds of millions or even billions of years ago. The conclusion was that this can't be entirely ruled out. It noted how few actual fossil remains we have for what we know of dinosaurs, and that there's a lot of space left in those gaps for all the evidence to have been destroy…

It's incredibly improbable. While much of the planet's surface is recycled constantly, there are also huge swaths of land that are billions of years old and haven't changed enough to hide evidence of complex society. Dinosaur fossils are rare, but not that rare. Tiny ones are abundant. If all life on earth ceased today, you could come back here in a billion years and find plenty of evidence everywhere. Maybe it's not 100% impossible, but it's so improbable that it belongs alongside other fringe theories.

Re: Two potentially life-friendly planets found orbiting a nearby star

#200

"just 12 light-years away" I love the "just". I know it's nearby on galactic scales but it's practically about 450,000 Earth years away with current technology :-)

there is an effort to put super mini spaceships on missions to other solar systems, and they would travel at something like 20% the speed of light. I think it works by having the probes be like the size of a cellphone or something, and being attached to a solar sail, then using an incredibly high powered laser to pump the solar sail full of energy to get it going so fast. I think if that architecture works they could reach ... proxima centauri? ... in something like 20 years.

just pointing that out to say that i think we have technology that would take less time than 450k years :)

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