The critical evidence for cosmic acceleration in 1998 came from two teams of astronomers,both observing:

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The critical evidence for cosmic acceleration in 1998 came from two teams of astronomers observing Type I supernovae. These supernovae were found to be fainter than expected, indicating that they were farther away from us than previously thought. This implied that the expansion of the universe was accelerating instead of slowing down. The critical evidence for cosmic acceleration in 1998 came from observations of Type I supernovae by two teams of astronomers, which showed that the universe was expanding at an accelerating rate.

The Critical Evidence for Cosmic Acceleration in 1998 Came from Two