Washington - NASA celebrates its 50th anniversary Wednesday, but the US space agency is hardly in the mood for partying.
Even NASA boss Michael Griffin, who is usually rather a cold technician, recently sounded the alarm. After all, the agency's greatest triumphs, notably the first moon landing, took place almost 40 years ago.
In public, Griffin restrains himself, but in private, he bluntly expresses his concern that US dominance in space could soon give way to China.