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NASA says distant exoplanet could have rare water ocean, possible hint of life

theguardian.com

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Re: NASA says distant exoplanet could have rare water ocean, possible hint of life

#71

Post by tchaffee »

dividedbyzero wrote: post #65
_nalply wrote: post #61

1. I looked up the phase diagram of water. If the mass is 10 times the earth, their athmospheric pressure might be one hundred times of ours. At that pressure, water boils at about 300°C. If ambient temperature is about 200°C then their chemistry would be completely incompatible with ours. And with hydrogen athmosphere anyway. 2. Re the Dark Forest hypothesis: maybe. They will discover our radio in about 60 years (as…

> Then they might assemble something like a robotic attack army and send it over Why would they want to though? What do we have here that someone who could do the above couldn't get much easier otherwise?

Divisive politics to the point of violence or even self destruction. Some pests you try to exterminate.

Re: NASA says distant exoplanet could have rare water ocean, possible hint of life

#72

Post by swarnie »

dividedbyzero wrote: post #65
_nalply wrote: post #61

1. I looked up the phase diagram of water. If the mass is 10 times the earth, their athmospheric pressure might be one hundred times of ours. At that pressure, water boils at about 300°C. If ambient temperature is about 200°C then their chemistry would be completely incompatible with ours. And with hydrogen athmosphere anyway. 2. Re the Dark Forest hypothesis: maybe. They will discover our radio in about 60 years (as…

> Then they might assemble something like a robotic attack army and send it over Why would they want to though? What do we have here that someone who could do the above couldn't get much easier otherwise?

[flagged]

Re: NASA says distant exoplanet could have rare water ocean, possible hint of life

#73

Post by bartread »

dividedbyzero wrote: post #65
_nalply wrote: post #61

1. I looked up the phase diagram of water. If the mass is 10 times the earth, their athmospheric pressure might be one hundred times of ours. At that pressure, water boils at about 300°C. If ambient temperature is about 200°C then their chemistry would be completely incompatible with ours. And with hydrogen athmosphere anyway. 2. Re the Dark Forest hypothesis: maybe. They will discover our radio in about 60 years (as…

> Then they might assemble something like a robotic attack army and send it over Why would they want to though? What do we have here that someone who could do the above couldn't get much easier otherwise?

[flagged]

Re: NASA says distant exoplanet could have rare water ocean, possible hint of life

#74

Post by blkhawk »

_nalply wrote: post #61

1. I looked up the phase diagram of water. If the mass is 10 times the earth, their athmospheric pressure might be one hundred times of ours. At that pressure, water boils at about 300°C. If ambient temperature is about 200°C then their chemistry would be completely incompatible with ours. And with hydrogen athmosphere anyway. 2. Re the Dark Forest hypothesis: maybe. They will discover our radio in about 60 years (as…

The mass isn't directly correlated to the gravity (~5-6G assuming rocky planet density in this case) and the amount of atmosphere also isn't guaranteed. It might have an atmosphere that merely doesn't extend as far into space. Basically an anti-Venus since it has similar mass to earth but a much thicker atmosphere.

Re: NASA says distant exoplanet could have rare water ocean, possible hint of life

#75

Post by wongarsu »

sigmoid10 wrote: post #53
molly0 wrote: post #23

Earlier quoted context omitted.

If 3, And The are truly advanced we should consider not communicating with them. Maybe they are hiding from someone else... ;) https://en.wikipedia.org/wiki/Dark_forest_hypothesis

If they are truly that advanced, they certainly already know about us. It seems kind of arrogant to presume that we could detect them with our primitive technology and they could not detect us. Most likely scenario is that they don't care about us in the same way we don't care about ants.

Even sending over a probe at 30% the speed of light would take 400 years, plus another 120 to hear back from it. No matter how interesting, for our human society it would be really hard to raise significant funds for a project that will only pay off in over 500 years, if at all. If they have similar lifespans, such a project might be similarly hard to get off the ground for their society.

That leaves radio communication, but the latest intel they have on us left earth around 1900. At that point we wouldn't have been able to receive anything from them. It's probably questionable if we would have picked something up had they sent a radio signal our way a week ago. Right now SETI might have a radio antenna pointed their way, but that won't last indefinitely, and these events are a bit hard to time from 120 lightyears away.

Re: NASA says distant exoplanet could have rare water ocean, possible hint of life

#76

Post by deafpolygon »

Gys wrote: post #11

Distance is 120 light years. So whatever we see is 120 years in the past. Getting there within a reasonable time frame is impossible with our current technology (an unmanned rocket will still needs 1000s of years). The good news: if there is intelligent life it will not easily get here either.

And if you think about it... 100-200 years of progress can be pretty significant. Just look at human civilization.

Re: NASA says distant exoplanet could have rare water ocean, possible hint of life

#78

Post by Anarch157a »

melvinmelih wrote: post #62
rowanG077 wrote: post #29

Earlier quoted context omitted.

Not that's not what he is implying. He is talking about time dilation.

How does one travel 1000 light years in a span of human lifetime (~80 yrs) if you’re not going faster than the speed of light?

With relativistic time dilation. 1000 years will pass on Earth, but on tge ship, it will be only a couple of decades, assuming they're close enough to the speed of light.

Re: NASA says distant exoplanet could have rare water ocean, possible hint of life

#79

Post by pvaldes »

gsky wrote: post #30
mpreda wrote: post #17

We can expect these posibilities: 1. no life 2. simple life 3. advanced intelligent civilization In the first two cases, we need to send a physical probe there. In the third case it might be enough, and much faster, to send communication signals there and get answers back. The third case is also arguably the most interesting.

What if the advanced civilization treats us like the way we treat animals? In my view it's better to stay away from the advanced civilizations

> What if the advanced civilization treats us like the way we treat animals?

As long as they don't treat us like we treat plants, it will be fine. I bet that that tomato didn't consent to be genetically raped with flounder's dna.

Re: NASA says distant exoplanet could have rare water ocean, possible hint of life

#80

Post by dghughes »

mpreda wrote: post #17

We can expect these posibilities: 1. no life 2. simple life 3. advanced intelligent civilization In the first two cases, we need to send a physical probe there. In the third case it might be enough, and much faster, to send communication signals there and get answers back. The third case is also arguably the most interesting.

4. dead or dying intelligent civilization

Slightly different than #1 assuming 'no life' means it never evolving

I can imagine a billion-year old civilization in its last gasps. Maybe it was a beautiful peaceful and technologically advanced civilization. Maybe it appeared and died before encountering any other advanced intelligent life from outside it's solar system.

Then again maybe it is dead from a nuclear or other catastrophic type of war.

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