The Pentagon’s intergalactic black-magic plot is getting ready to raise the dead. Dead satellites, that is. Last year, Darpa, the military’s blue-sky research agency, kicked off a program designed to harvest parts from unused communications satellites still orbiting the Earth, and then turn those bits and pieces — antennas in particular — into an array that operates as a low-cost “communications farm” for troops on the ground. Now that program, called Phoenix, is entering a new phase. First, Darpa last week issued a bid to commercial satellite owners, asking for “a candidate satellite” that’ll act as a space-based guinea pig for initial evaluations of the technology requisite for the initiative. And today, the agency hosted a conference on “sustainable satellite servicing” — attended by academics, private companies and military experts — to discuss everything from the program’s regulatory challenges to more technical “operational considerations” necessary to revive dead satellites.