Ever since two teams of astronomers announced in 1998 that the expansion of the universe appeared to accelerating with time, other teams of astronomers have been double-checking their conclusions with data from other sources. Although some astronomers still have doubts about the accelerating universe, evidence in its favour continues to grow. The latest comes from studies of the deviation of galaxy velocities from a smooth universal expansion (I Zehavi and A Dekel 1999 Nature 401 252).
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