Copied from Poul Anderson Appreciation today:
Poul
Anderson wrote many works about interstellar travel and three novels
about intergalactic travel. James Blish wrote a tetralogy whose volumes
are successively interplanetary, interstellar, intergalactic and
inter-cosmic. Blish is comparable to Anderson but with a much smaller
output.
Since both wrote galactic sf, I wondered how
much information either of them imparted about the structure of the
galaxy. Blish describes both a photograph and a model. See previous
post. He also recounts this exchange over the instantaneous Dirac
communicator:
"'EARTH POLICE AA EMERGENCY ACOLYTE
CLUSTER CONDENSATION XIII ARM BETA...SYSTEM UNDER ATTACK BY MASS ARMY OF
TRAMP CITIES. POLICE AID URGENTLY NEEDED. LERNER LIEUTENANT FORTY-FIFTH
BORDER SECURITY GROUP ACTING COMMANDER CLUSTER DEFENSE FORCES.
ACKNOWLEDGE.'"
-Cities In Flight (New York, 1981), pp. 394-395.
"'LERNER
ACOLYTE DEFENSE FORCES YOUR MESSAGE IN. SQUADRON ASSIGNED YOUR
CONDENSATION ON WAY. HANG ON. BETA ARM COMMAND EARTH.'" (p. 395)
This
tells us something about police, defense and galactic structures. The
Acolyte Cluster is in the thirteenth condensation of the second spiral
arm. I know that stars form from condensation of primordial elements but
nowhere else have I seen "condensation" used to describe a part of the
galaxy. Here, a condensation is intermediate between a cluster and an
arm.
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