Copied from Poul Anderson's Cosmic Environments, 26 Dec 2014.
The following propositions are facts within Poul Anderson's History of Technic Civilization:
planetary systems do not condense around giant stars;
Beta
Centauri is a giant star with planets because, while it was condensing,
its nebula retarded, then captured, a group of rogue planets;
van Rijn says in "Lodestar" that scientists are still trying to figure out how the red giant Betelgeuse has planets;
Mirkheim was a planet of fifteen hundred Terrestrial masses orbiting a star as bright as a hundred Sols.
So how did Mirkheim exist? We are told how it was found:
"From
the known distribution of former supernovae, together with data on
other star types, dust, gas, radiation, magnetism, present location and
concentrations, the time derivatives of these quantities: using
well-established theories of galactic development, it is possible to
compute with reasonable probability the distribution of undiscovered
dark giants within a radius of a few hundred parsecs....The most you can
learn is the likelihood (not the certainty) of a given type of object
existing within such-and-such a distance of yourself, and the likeliest
(not the indubitable) direction."
-Poul Anderson, David Falkayn: Star Trader (New York, 2010), p. 653.
But
the "...given type of object..." has to be possible, however
improbable, in the first place. Surely Astrocenter would not have been
able to compute the probability of a condensing giant star capturing
several rogue planets? So how was Mirkheim's probability computed?
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