but not long ago a group of astronomers proposed a new planet definition: effectively everything spherical should be called planet, and a few Ceres-like objects around Trappist-1 are totally plausible
Yes, I realise that. But currently the problem in planetary astronomy to which I was referring is nomenclature. I mean, I can see why astronomers think that “Earthlike” is good for budget; but “rocky” is imprecise (with or without metal core?) and the ongoing arguments over the status of Pluto - still not dead - show how emotionally and politically entwined is the whole thing. Detecting more of them and finding out more about them is good, but the water - what the discoveries actually mean - seems to be getting more and more muddy.
Starwisp’s first mission? Not that we’d get data back in any of our lifetimes. I desperately want to know what’s there but news like this always brings out the space cadets (not on here) with unrealistic expectations.
If they speak British English, what they’d send back is “Shut your trap!”
(I don’t know for certain if the expression derives from the Trappists but I suspect so. Cockney rhyming slang would be “keep your norf shut” (norf and south = mouth) but by no means all Cockney slang is rhyming - and it includes elements of many cultures, e.g. scarper = to leave in a hurry.)
Based on a bolometric luminosity of 0.000525 Suns for Trappist-1, only planets “d” and “e” are clearly in the conventional habitable zone, planets “c” and “f” would be marginal, and the others either too hot or too cold by conventional habital zone criteria. But, if planets f, g, and h are tide-locked, their substeller points might be warm enough for liquid water with the rest of the planet frozen. Despite its terrestrial mass, planet “b” seems to have an extensive envelope–perhaps Venusian in character and with 4.3 times terrestrial insolation at wavelenths that are more effective at heating than the Sun’s, it is not a good prospect for liquid water. These new numbers make planet “c” somewhat denser than Earth, but the others are significantly less dense. There is other evidence of an envelope around planet c (hydrogen spectroscopy).
So NASA tells us about tiny invisible planets light years away and we’re all agog! but when they tell us about climate change happening right here right now somehow it’s all a con and should be repressed in case it frightens the investors
We need neither “Earthlike” worlds nor “Sunlike” stars to colonize outside our Solar system. All we need is accessible material to build orbital colonies out of, and a star that is stable enough not to threaten those colonies. Planets and moons are actually horrible places to attempt colonization. I wish the media would give up on the nonsense about “colonizing Mars” or the Moon.