Worried advocates of Mars exploration are waiting for the other shoe to drop in the wake of NASA’s cancellation of the Mars Telecommunications Orbiter — and with good reason. The same budgetary pressures that drove that decision likely will force agency officials to seriously consider postponing a nuclear-powered Mars rover mission that was supposed to rely on the telecom orbiter to relay back to Earth the large, steady stream of data it would produce.

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Greg Thomas is a co-owner of SpaceNews. Greg is also a member of SpaceNews’ Board of Directors. Greg's experience spans both print and digital businesses. Before joining SpaceNews, he served as COO of Inside Communciations, a sports publishing...