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[Space] Found! Potentially Earth-Like Planet at Proxima Centauri Is Closest Ever - Page 7

post #61 of 100
Quote:
Originally Posted by essanbee View Post

Everyone who believes that there has to be something out there is speculating.

True.
Quote:
Originally Posted by essanbee View Post

I am not belittling your blind belief in their existence.
Who's blind belief?

I find the assumption that there is life out there to be premature, though forgivable, given how little we have explored--the worlds we've visited and the minuscule slice of space and time we can observe indirectly amount to very, very little.

The conviction that there is nothing else out there is much less forgivable, for precisely the same reason.
Quote:
Originally Posted by essanbee View Post

Until proven otherwise; We Are Alone.

We are either alone or we are not.

Barring thought experiments like Schrödinger's Cat, or nonsensical ideas that a tree falling in the forest makes no sound if no one is around to hear it, our perception has no bearing on the existence or non-existence of anything outside that perception. If we do discover life somewhere else at some point, we don't magically become not alone. It would have been there regardless of our discovery.
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post #62 of 100
Quote:
Originally Posted by Blameless View Post


Who's blind belief?


We are either alone or we are not.

Several stated there must be something out there. With zero evidence that there is. That is who.

I accept your correction of my last statement.
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post #63 of 100
Quote:
Originally Posted by redfroth View Post



On a side note if Proxima Centauri b hosts a habitable world we probably don't have to worry about it having a civilization on it as we haven't observed any radio transmissions from it.

The ancient Greeks had a fairly advanced civilization and you wouldn't have observered any radio transmissions from them - or the Egyptians before or the Romans after. Or Napoleonic France, Victorian England, colonial America, the Mayas, Incas, Imperial China. Surely at least one of those would qualify as a civilization.

Not saying advanced civilizations (albeit radioless) are plentiful out there, either. Time is another issue, there might have been a highly advanced civilization that flourished for a million years just 5 million light years away - and we won't know about it for 4 million more years. Having advanced civilizations close to each other and existing at the same time is just another hurdle. Humans seem to think the couple of centuries we've even known what stars actually are is a long time. It's not.

I'd be more inclined towards 1 planet in a million having slime mold as the top life form before being sterilized back to naught by a gamma ray burst or asteroid impact.
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post #64 of 100
Quote:
Originally Posted by GnarlyCharlie View Post

Yeah, getting there.

4.2 LY, right in our backyard, right next door! Let's hop in our space cruiser and head out!

New Horizons was the fastest thing humans have launched, about 36K MPH (after it got up to speed). Let's bump it up to 50K MPH, we're well further advanced than we were when that relic launched.

That'll get us to Proxima A in what, 55,000 years? Our backyard, right next door! Oh, and then you will have to figure out how to stop at Proxima, not just whiz right on by like New Horizons did at Pluto. Using 30 years per generation, you are looking at over 1800 generations or we can use our awesome new cryo-hibernation technology and just suspend the travelers for 55 centuries. What? we don't have that new cryo-hibernation technology up and running yet? Well, we'll just go faster! What? That'll make it just that much harder to stop when we get there?

Habitable zone. Earth and Venus are both in the "habitable zone". It's a little less hospitable on Venus, daytime temps in the balmy 850°F range with atmospheric pressure over 1300 psi. It would be a real bummer to travel for 50 thousand years and find Venus waiting for you.


The fastest man made object is actually the Voyager 1, leaving us at the rate of 17km/s, but it still take them 40000 years to cover the distance between Earth and Promixa Centuri. Our current technologies could easily shorten that duration to half or more, but that is still outside the realm of feasibility.


We need to be able to breakthrough and study the outer edge of our solar system, or explore far distance world like Planet 9 (if it exist) before we can do anything to other world. Even for planet 9 that distance is a daunting task. 700 AU Semi-Major Axis orbit will take something like Innovative Interstellar Explorer 90 years to reach.
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post #65 of 100
Quote:
Originally Posted by mouacyk View Post

@Essenbe I'll do you one better. The Earth is still the center of the universe.

Not to be one-upped, my dog is the center of the universe!

Comically, I believe that is technically true what with the universe starting at a singularity, literally everywhere is the center of the universe or something to that effect.

Quote:
Originally Posted by GnarlyCharlie View Post

I'd be more inclined towards 1 planet in a million having slime mold as the top life form before being sterilized back to naught by a gamma ray burst or asteroid impact.

If memory serves there is evidence that life on earth started once, was wiped out during the late heavy bombardment, then started up again a second time.

It's that nice 3 billion year evolutionary time frame to reach multi-cellular life forms that is probably the biggest roadblock to intelligent life.
Edited by DNMock - 8/26/16 at 7:06pm
post #66 of 100
Maybe there is another dinosaur era before the dinosaur era which we know.
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post #67 of 100
http://www.iflscience.com/space/everything-you-need-to-know-about-proxima-b-the-closest-earthlike-exoplanet-to-earth/

This article suggests that we aren't certain it even exists. They say we are pretty sure it does, but not certain. They also say that it is probably 1.3 times the size of the Earth, but it might be up to 3 times Earth size. No question, it's an exciting discovery, and of course we need to learn more about it, but we aren't even sure it exists.

It just emphasizes that although our aspirations are high, we are just so limited because of the vastness of space and our current level of technology.

Rylant
post #68 of 100
We are so 56kbps mad.gif
post #69 of 100
Quote:
Originally Posted by guttheslayer View Post

The fastest man made object is actually the Voyager 1, leaving us at the rate of 17km/s, but it still take them 40000 years to cover the distance between Earth and Promixa Centuri. Our current technologies could easily shorten that duration to half or more, but that is still outside the realm of feasibility.


We need to be able to breakthrough and study the outer edge of our solar system, or explore far distance world like Planet 9 (if it exist) before we can do anything to other world. Even for planet 9 that distance is a daunting task. 700 AU Semi-Major Axis orbit will take something like Innovative Interstellar Explorer 90 years to reach.

There's tech out there we're experimenting with that in theory, would get us there in 100 years. But this is cutting edge stuff where we're trying to make warp bubbles or that billion dollar cannon recoil engine that would be GREAT for getting there but good luck with space debris and slowing down to enter the planet's orbit.
post #70 of 100
There has been tech, which in theory, could get us there in ~100 years that's been around since the early 1960s, but it was killed by the partial test ban treaty of 1963.

Yes, I'm referring to Project Orion, which is still the most technically feasible way to move anything of truly significant mass in any non-geological period of time over interplanetary or interstellar distances. Simply can't beat the combination of high exhaust velocity and high reaction mass that an atomic weapon can deliver, at least with any technology that is remotely feasible in the short to medium term.

The real irony is, that from a purely technical aspect, Orion's nuclear pulse propulsion would have required less work to being flying to a star in 1960 than something like StarShot would today (or even likely 10-20 years from now). Of course, without something like the rabid nationalism and degree of competition of a cold war arms race fueling space travel, no one is keen to sink real money into much of anything.
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