The rationale for the Blue Gemini program which caused it to be
funded is largely as a defence against a feared Soviet “orbital
bombardment system”: one or more satellites which, placed in
orbits which regularly overfly the U.S. and allies, could be commanded
to deorbit and deliver nuclear warheads to any location below.
It is the development of such a weapon, its deployment, and a mission to
respond to the threat which form the core of the plot of this novel.
But an orbital bombardment system isn't a very useful weapon, and
doesn't make much sense, especially in the context of the late 1960s
to early '70s in which this story is set. The
Krepost of the
novel was armed with a single high-yield weapon, and operated in a low
Earth orbit at an inclination of 51°. The weapon was equipped with only
a retrorocket and heat shield, and would have little cross-range (ability
to hit targets lateral to its orbital path). This would mean that in
order to hit a specific target, the orbital station would have to wait
up to a day for the Earth to rotate so the target was aligned with the
station's orbital plane. And this would allow bombardment of only a
single target with one warhead. Keeping the station ready for use
would require a constant series of crew ferry and freighter launches,
all to maintain just one bomb on alert. By comparison, by 1972, the
Soviet Union had on the order of a thousand warheads mounted on
ICBMs, which required no space launch logistics to maintain, and could
reach targets anywhere within half an hour of the launch order being
given. Finally, a space station in low Earth orbit is pretty much a
sitting duck for countermeasures. It is easy to track from the ground,
and has limited maneuvering capability. Even
guns in space
do not much mitigate the threat from a variety of anti-satellite
weapons, including Blue Gemini.
While the drawbacks of orbital deployment of nuclear weapons
caused the U.S. and Soviet Union to eschew them in favour of more
economical and secure platforms such as silo-based missiles and
ballistic missile submarines, their appearance here does not make
this “what if?” thriller any less effective or
thrilling. This was the peak of the Cold War, and both adversaries
explored many ideas which, in retrospect, appear to have made
little sense. A hypothetical Soviet nuclear-armed orbital battle
station is no less crazy than
Project Pluto
in the U.S.