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

Post by jl6 » Tue, Sep 12, 2023, 4:41 PM UTC

wfhBrian wrote: post #110

_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 after Violence is undeniably primitive behavior. It amazes me how many humans assume that other species would advance technologically to the point of interstellar travel while still holding on to primitive roots. It's extra surprising from a community like HN where an abundance mindset is the status quo.

Post by Grimburger » Tue, Sep 12, 2023, 5:16 PM UTC

CalRobert wrote: post #42

Grimburger wrote: post #8

Earlier quoted context omitted.

> Presumably sending a probe would not be feasible in any foreseeable timeframe? With global resources we can do it easily but the people in charge of our countries wouldn't have a job if they didn't invent fake boogeymen to waste cash on instead. We have plenty of starshot proposals that are incredibly cheap compared to other things: https://en.wikipedia.org/wiki/Breakthrough_Starshot

..... How do you propose getting a probe to something 120 light years away and getting an answer within a human lifetime, unless you're going for a ride on the probe? Do you have some new physics?

Post by Enginerrrd » Tue, Sep 12, 2023, 5:52 PM UTC

jl6 wrote: post #130

jayGlow wrote: post #125

Earlier quoted context omitted.

the dark forest requires a relatively simple cheap and effective way of sterilizing a stat system. if there is an easy way to do that then a first strike becomes a more reasonable first contract option.

Hopefully there is no way to drop a contaminant into a star to affect its output. A +/-10% change in brightness over a sustained period would probably neutralize us.

Post by baja_blast » Tue, Sep 12, 2023, 6:10 PM UTC

pharmakom wrote: post #69

dividedbyzero wrote: post #65

Earlier quoted context omitted.

> 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?

To ensure that we don’t do the same.

Post by hermitcrab » Tue, Sep 12, 2023, 6:32 PM UTC

pomtato wrote: post #120

CalRobert wrote: post #40

Earlier quoted context omitted.

""" Time dilation is the difference in elapsed time as measured by two clocks, either due to a relative velocity between them (special relativity) or due to a difference in gravitational potential between their locations (general relativity). When unspecified, "time dilation" usually refers to the effect due to velocity. """ https://en.wikipedia.org/wiki/Time_dilation

wow thanks! this was super fun, do you happen to have some souce about the calculations that go into determining the time dilation based on different velocity? i'm aware about black holes being capable of well, doing time dilation thingy due to their massive gravitational force but nothing else. edit: souce as in something a regular average joe can make sense of haha