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#151 2024-02-22 20:21:55

Mars_B4_Moon
Member
Registered: 2006-03-23
Posts: 9,772

Re: Extrasolar Habitable Planets

If Hycean Worlds Really Exist, What are Their Oceans Like?

https://www.universetoday.com/165838/if … eans-like/

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#152 2024-04-01 07:43:24

Void
Member
Registered: 2011-12-29
Posts: 7,298

Re: Extrasolar Habitable Planets

This article describes a measurement that says that Trappist-b is not habitable for non-human life.
https://www.msn.com/en-us/news/technolo … r-BB1kSuYx
Quote:

However, TRAPPIST-1 b, is the innermost planet and receives about four times the amount of energy that Earth gets from the Sun.

The indication is, no atmosphere.  Which is not that surprising as it gets about twice the amount of solar radiation as Venus does.

The planet may resemble a larger version of Mercury, perhaps.

But I would hope that it was actually tidal locked.  In that case perhaps ~40% of its surface might be in a rather permanent deep cold.

Such a world might harbor glaciation in the darkness, and under sufficient ice, perhaps even liquid water.  Ice shell worlds we think exist such as Europa may have this in common with it.  So, that actually that world might harbor life, if Trappist-b has volcanism under the ice.  This is of course a "Maybe".  It may have tidal heating due to the 6 other known planets and its star.

Such a world might be attractive to humans or similar beings, should they be able to travel to it.  But I believe it is 40 light years away.

Other people look at Proxima Centauri-b and see a world that is just a bit larger than Earth.  On a bet, my money would be that it does not have an atmosphere either.

I would be more interested in Proxima Centauri-d, which is closer to the star, and about 2 times the mass of Mars, I believe.

That world without an atmosphere, and tidal locked may have a hot sunward side, dry, and a cold darker side with ices.  A technological society might do quite a bit with that.

https://en.wikipedia.org/wiki/Proxima_Centauri_d
Quote:

Proxima d is a sub-Earth at least one-quarter of the mass of Earth (or twice the mass of Mars), orbiting at roughly 0.029 AU (4.3 million km; 2.7 million mi) every 5.1 days.[2] It is the least massive and innermost known planet of the Proxima Centauri system. It is the least massive exoplanet detected with the radial velocity method as of 2022. Although Proxima d orbits too close to its star to have a habitable equilibrium temperature (which likely reaches 360 K (87 °C; 188 °F)[1] from about 190% of Earth's irradiation—assuming an Earth-like reflectivity, it is theoretically possible that Proxima d possesses polar regions with habitable temperatures.

But it could resemble Mercury and not be tidal locked, in which case it may have shadowed craters at its poles, with ices in them.

That world is perhaps the closest extra solar planet to us, accessible with our imagined technical abilities.  It would have lots of energy, solar, and maybe geothermal.  And if it did have ices in the cold places, might be quite a planet to set up camp on.

Done

Last edited by Void (2024-04-01 08:00:18)


Done.

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#153 2024-04-03 10:20:38

Void
Member
Registered: 2011-12-29
Posts: 7,298

Re: Extrasolar Habitable Planets

Although the planet described here may be at most marginally habitable, it does seem to be evidence that tidal locked planets can exist.

https://phys.org/news/2024-04-tidally-s … lanet.html
Quote:

First tidally locked super-Earth exoplanet confirmed
by Bob Yirka , Phys.org

I take encouragement from that.  I have had further thoughts about tidal locked planets, with a lack of atmosphere.  Those and Rogue Worlds as well.

The science and also the media communities seem to be obsessed about discovering life and even aliens with skill levels greater or less than ours.  I don't tend to be that way.  If it turns out to exist then it has to be processed by our culture, if they don't kill us.

It appears that Fusion is eventually going to become a real thing as per power plant potential.  That and Orion Type Drives says that eventually, if the human race is able to avoid severe mass insanity, humans and their machines may go to interstellar planets, such as Rogues, and Tidal Locked ones.  These are unlikely to have fostered competitive aliens.  I consider that to be a good thing.

So, with the proper tools some of these worlds can be refashioned to a suitable use for humans and their machines.

Done

As for around Red Dwarfs, we might want to hope to find a Titan orbiting a Saturn.  With a very cold Nitrogen atmosphere, and perhaps protected by a magnetic field from the parent planet as Saturn protects Titan.  Having an energy source, a lot could be done with something like that.

Done

Last edited by Void (2024-04-03 10:44:26)


Done.

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#154 2024-04-12 10:57:37

Mars_B4_Moon
Member
Registered: 2006-03-23
Posts: 9,772

Re: Extrasolar Habitable Planets

NASA's planet-hunter TESS temporarily shuts off

https://www.spacedaily.com/reports/NASA … f_999.html

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#155 2024-04-13 11:07:19

Void
Member
Registered: 2011-12-29
Posts: 7,298

Re: Extrasolar Habitable Planets

Materials in this post suggest that solar wind does not strip atmosphere as much as was thought, in the cases of Venus and perhaps Mars: 
https://newmars.com/forums/viewtopic.ph … 58#p221758
Quote:

The idea of a magnetic field for Mars has been an exciting one, but recent information suggests that it is not needed.

https://newmars.com/forums/viewtopic.ph … 05#p221605

If you go to minute 8.06 of this video it is suggested that the losses have not been that much: https://www.patreon.com/posts/interstel … -102029505

It is said that over 3.9 billion years they calculate that Venus would have lost .02 to .6 meters of water to the solar wind.  And they think that Mars is somewhat the same.

I am willing to say that it is not certain how much good a magnetic field might do.

This will be interesting for Red Dwarf worlds as well.  They may have greater power to hold an atmosphere than has been thought.

Done

Perhaps it will be discovered that a Red Dwarf might make some planets more Earthlike by stripping away a Hycean original atmosphere, and yet perhaps allowing a secondary atmosphere.

https://en.wikipedia.org/wiki/Hycean_planet

Done

Last edited by Void (2024-04-13 11:09:37)


Done.

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#156 2024-04-20 13:52:22

Mars_B4_Moon
Member
Registered: 2006-03-23
Posts: 9,772

Re: Extrasolar Habitable Planets

In search for alien life, purple may be the new green
https://phys.org/news/2024-04-alien-lif … green.html
Instead of green, many such bacteria on Earth contain purple pigments, and purple worlds on which they are dominant would produce a distinctive "light fingerprint" detectable by next-generation ground- and space-based telescopes, Cornell scientists report in new research

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#157 2024-05-05 03:15:33

Mars_B4_Moon
Member
Registered: 2006-03-23
Posts: 9,772

Re: Extrasolar Habitable Planets

Kepler part 2 is 'Made in China?


China Is Hatching a Plan to Find Earth 2.0
https://www.scientificamerican.com/arti … earth-2-0/
A satellite will scour the Milky Way for exoplanets orbiting stars just like the sun

The Earth 2.0 satellite is designed to carry seven telescopes that will observe the sky for four years. Six of the telescopes will work together to survey the Cygnus–Lyra constellations, the same patch of sky that the Kepler telescope scoured. “The Kepler field is a low-hanging fruit, because we have very good data from there,” says Jian Ge, the astronomer leading the Earth 2.0 mission at the Shanghai Astronomical Observatory of the Chinese Academy of Sciences.

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#158 2024-05-26 17:50:19

Mars_B4_Moon
Member
Registered: 2006-03-23
Posts: 9,772

Re: Extrasolar Habitable Planets

Marvel at the Variety of Planets Found by TESS Already

https://www.universetoday.com/167111/ma … s-already/

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#159 2024-06-06 03:04:59

Mars_B4_Moon
Member
Registered: 2006-03-23
Posts: 9,772

Re: Extrasolar Habitable Planets

NASA's Webb Telescope Observes Potentially Habitable Exoplanets

https://www.spacedaily.com/reports/NASA … s_999.html

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