WASHINGTON — The Russian space agency, Roskosmos, has decided to postpone the launch of a mission to the martian moon Phobos from 2009 to 2011, according to a U.S. scientist involved in the first Russian-led interplanetary mission in more than a decade.

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Brian Berger is editor in chief of SpaceNews.com and the SpaceNews magazine. He joined SpaceNews.com in 1998, spending his first decade with the publication covering NASA. He was named senior staff writer in 2004, a position he held until being named...