You Couldn't Make This Up Dept: The Mystery of Mars' Moon Phobos Deepens
“..Some of the more fascinating, and wild speculative theories swirling around the Phobos Gunt Mission at sites like EnterpriseMission.com see it as “the single most important scientific mission in the history of the past half-century of modern solar system exploration …. with Phobos as an ancient solar system relic from an extraordinarly distant, pre-human, apparently solar-system-wide ancient high-tech civilization. One that could ultimately turn out to be directly related to our own.
It is expected that Earth-based ESA stations will take part in controlling Phobos-Grunt, receiving telemetry and making trajectory measurements, including implementation of very long-baseline interferometry (VLBI). This cooperation is realized on the basis of the agreement on collaboration of the Russian Federal Space Agency and ESA in the framework of the Phobos-Grunt and ExoMars projects (see post above).
In the late 1950s and 1960s, the unusual orbital characteristics of Phobos led to speculations that it might be hollow. Around 1958, Russian astrophysicist Iosif Samuilovich Shklovsky, studying the secular acceleration of Phobos' orbital motion, suggested a “thin sheet metal” structure for Phobos, a suggestion which led to speculations that Phobos was of artificial origin. Shklovsky based his analysis on estimates of the upper Martian atmosphere's density, and deduced that for the weak braking effect to be able to account for the secular acceleration, Phobos had to be very light…”