The Supernova Cosmology Project measured the brightness-redshift relation of Type Ia supernovae to constrain matter density and the contribution represented by a cosmological constant. Its high-redshift sample was fitted together with nearby events after standardizing peak brightness using light-curve information.[ref]
Its importance includes an independent observing and analysis effort alongside the High-Z Supernova Search Team. Independence of teams does not eliminate all shared uncertainty: both rely on related supernova physics, nearby calibration and assumptions connecting luminosity distance with an expansion model.

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  1. Supernova discovery of accelerating expansion
  2. Accelerating expansion of the universe
  3. Deceleration parameter
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