Robert M. Lightfoot Jr. has been heading NASAs efforts ever since the previous administrator, Charles F. Bolden Jr., stepped down with President Obama. Since he never officially became Boldens replacement — he was acting administrator for 14 months — his previous job as NASAs third highest-ranking official was never filled. The second highest position in the agency also remains empty, so now that Lightfoot has decided to retire on April 30th, NASA has no clear successor to take o……
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