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    Thread: Planets in process of, but with not a fully complete, runaway greenhouse
Post: Planets in process of, but with not a fully comple...

Hello, are there any planets in the OA setting that are in progress of having a classical runaway greenhouse but their oceans haven't fully boiled into the atmosphere yet? How would be the weather pat...
MichaelPoole General Setting Discussion 1 35 04-04-2024, 06:59 PM
    Thread: Negentropy Alliance Update
Post: RE: Negentropy Alliance Update

Quote: -- Within the Negentropist domain there are planets implementing all forms of hierarchical organisation, from classical theocracies such as the Loyalists of Gegton X to mind-controlling techn...
MichaelPoole Encyclopaedia Galactica Articles 18 254 04-04-2024, 06:42 PM
    Thread: Hycean worlds (Pyrohydrothallasic worlds in OA)
Post: RE: Hycean worlds (Pyrohydrothallasic worlds in OA...

Beautiful images but aren't pyrohydrothalassics hot by definition while Hyceans can be temperate?
MichaelPoole Art and Visual Media 13 179 04-04-2024, 07:33 AM
    Thread: Planetary classification
Post: RE: Planetary classification

How much can Neptunian conditions vary? I was thinking such worlds could be more varied than what one would expect, from basically Cytherean worlds with H/He dominated atmospheres to having a sea of m...
MichaelPoole General Setting Discussion 365 7,356 10-12-2023, 06:31 AM
    Thread: Pen-y-ghent system in Universe Sandbox 2
Post: RE: Pen-y-ghent system in Universe Sandbox 2

stevebowers Wrote: (07-21-2023, 09:50 PM) -- I don't know if you can use them, but here are some Io-like textures I have found in my files. Free for anyone to use. -- Thank you! Will def finish t...
MichaelPoole Art and Visual Media 6 100 08-01-2023, 10:22 AM
    Thread: Pen-y-ghent system in Universe Sandbox 2
Post: RE: Pen-y-ghent system in Universe Sandbox 2

stevebowers Wrote: (07-20-2023, 06:02 PM) -- Fantastic! We can replace the images in the article with yours if you like. I admit I sometimes confused radius with diameter in my early articles; w...
MichaelPoole Art and Visual Media 6 100 07-20-2023, 11:58 PM
    Thread: Pen-y-ghent system in Universe Sandbox 2
Post: Pen-y-ghent system in Universe Sandbox 2

Pent-y-ghent system doesn't really have a lenghty description apart from Ribblehead but it has a nostalgic value for me (one of the first Orion's Arm articles I've read) so here's my take on it in Uni...
MichaelPoole Art and Visual Media 6 100 07-20-2023, 11:59 AM
    Thread: Is GJ 1214 in Orion's Arm?
Post: Is GJ 1214 in Orion's Arm?

Given the recent discoveries of a steam rich atmosphere and measurement of (presumably cloudtop) temperatures of GJ 1214b by JWST (more here A reluctant exoplanet lifts its veil – a bit | Max Planck I...
MichaelPoole Encyclopaedia Galactica Articles 1 40 06-23-2023, 04:09 AM
    Thread: Seven Marbles (TRAPPIST-1) - Pre-Terragen
Post: RE: Seven Marbles (TRAPPIST-1) - Pre-Terragen

dangerous_safety Wrote: (10-08-2020, 09:36 AM) -- considering this is a nearby system if scientific interest, and a future JWST target, I wouldn't say its done even after this iteration is finished. ...
MichaelPoole Encyclopaedia Galactica Articles 30 559 06-22-2023, 05:12 AM
    Thread: Spacecraft propulsion article updates
Post: RE: Spacecraft propulsion article updates

IIIRC somewhere here earlier someone wrote fusion NSWRs are "unrealistic" and cut them off the setting. Seems like that may not be the case http://www.projectrho.com/public_html/rocket/enginelist2.php...
MichaelPoole General Setting Discussion 43 547 02-20-2023, 08:13 PM
    Thread: Minimum usable acceleration for a spacecraft
Post: RE: Minimum usable acceleration for a spacecraft

Drashner1 Wrote: (02-01-2023, 11:19 PM) -- I'm not saying that it would, I'm saying that even if it did, it wouldn't matter. Most solar sail missions that I've ever read about involve moving cargo ar...
MichaelPoole General Off-topic Discussion 10 5,859 02-02-2023, 03:33 AM
    Thread: Minimum usable acceleration for a spacecraft
Post: RE: Minimum usable acceleration for a spacecraft

Drashner1 Wrote: (01-31-2023, 04:17 AM) -- e) Using one of the many available acceleration calculators online, it comes up that a constant acceleration 3 milligee boost gets you across an AU of dista...
MichaelPoole General Off-topic Discussion 10 5,859 02-01-2023, 09:58 PM
    Thread: Minimum usable acceleration for a spacecraft
Post: Minimum usable acceleration for a spacecraft

Hello, apologies if this is in the wrong section, it's hard SF related but it didn't seem to fit any other part of the forum for me. So, when reading up on rocketry on Projectrho, I came upon this ...
MichaelPoole General Off-topic Discussion 10 5,859 01-30-2023, 11:06 PM
    Thread: Argus Array capabilities near its limit
Post: RE: Argus Array capabilities near its limit

stevebowers Wrote: (08-12-2022, 10:12 PM) -- Actually, even at z-60 the wavelength of sunlight from a sun-like star would still be in the infrared spectrum. Infrared radiation wavelength extends all ...
MichaelPoole General Setting Discussion 10 133 08-13-2022, 07:54 PM
    Thread: Argus Array capabilities near its limit
Post: RE: Argus Array capabilities near its limit

stevebowers Wrote: (08-12-2022, 02:25 AM) -- Angular diameter distance is the most important factor for the apparent size of a distant galaxy or other object more than about seven billion light years...
MichaelPoole General Setting Discussion 10 133 08-12-2022, 06:37 AM
    Thread: Argus Array capabilities near its limit
Post: RE: Argus Array capabilities near its limit

https://www.orionsarm.com/forum/showthread.php?tid=4070&pid=48143#pid48143 Is this for comoving or light travel distance?
MichaelPoole General Setting Discussion 10 133 08-12-2022, 01:58 AM
    Thread: Argus Array capabilities near its limit
Post: Argus Array capabilities near its limit

So, I've just read the Argus Array article and it is way cooler than I expected. The notion of being able to see 10 km objects in the Andromeda Galaxy after just 10 seconds and objects smaller than a ...
MichaelPoole General Setting Discussion 10 133 08-11-2022, 03:00 PM
    Thread: The Garden Worlds article
Post: RE: The Garden Worlds article

The real challenge is not the pressure. The critical point of water is far less than say, the pressure in the Mariana Trench where macroscopic organisms live. No, the real challenge is temperature.
MichaelPoole Encyclopaedia Galactica Articles 13 230 06-14-2022, 06:59 PM
    Thread: The Garden Worlds article
Post: RE: The Garden Worlds article

What I find most challenging - and interesting! - about envisioning life based in supercritical water is the chemistry tbh. Supercritical water is a great solvent and in deep ocean worlds may even be ...
MichaelPoole Encyclopaedia Galactica Articles 13 230 06-14-2022, 09:49 AM
    Thread: The Garden Worlds article
Post: RE: The Garden Worlds article

The Astronomer Wrote: (06-10-2022, 10:06 AM) -- MichaelPoole Wrote: (06-10-2022, 10:02 AM) -- The Garden World article has many potentially very interesting and cool planets, including biospheres us...
MichaelPoole Encyclopaedia Galactica Articles 13 230 06-10-2022, 10:15 AM