The acceleration of the Universe in the light of supernovae -- The key
  role of the Cerro Tololo Inter-American Observatory
  The discovery of acceleration and dark energy arguably constitutes the most
revolutionary discovery in astrophysics in recent years. Cerro Tololo
Inter-American Observatory (CTIO) played a key role in this amazing discovery
through three systematic supernova surveys organized by staff astronomers: the
"Tololo Supernova Program" (1986-2000), the Calan/Tololo Project (1989-1993),
and the "High-Z Supernova Search Team" (1994-1998). CTIO's state of the art
instruments also were fundamental in the independent discovery of acceleration
by the "Supernova Cosmology Project" (1992-1999). Here I summarize the work on
supernovae carried out from CTIO that led to the discovery of acceleration and
dark energy and provide a brief historical summary on the use of Type Ia
supernovae in cosmology in order to provide context for the CTIO contribution.
