  An overview is given of the current status of the theory and observations of
the acceleration of the expansion of the observable part of the Universe.
  Contents
  1. Historical Introduction
  2. Friedmann equations and cosmological acceleration
  3. Vacuum energy problem
  4. Data in favor of cosmological acceleration
  5.Data on supernovae and baryon acoustic oscillations
  5.1 Cosmography primer: distances in the Universe; 5.2 Photometric distance;
5.3 Cosmic distance ladder; 5.4 Variety of type-Ia supernovae light curves and
their usage in cosmography; 5.5 Baryon acoustic oscillations (BAOs); 5.6 BAOs
in the correlation function of galaxies; 5.7 Summary of results on supernovae
combined with BAOs; 5.8 Systematics and dependence on z; 5.9 Supernovae as
primary distance indicators; 5.10 Merging of neutron stars and the standard
siren method
  6. Dark energy
  7. Modified gravity
  8.Conclusion
  9.Appendices
  9.1 Derivation of the Friedmann equations; 9.2 Cosmological parameters; 9.3
Scalar field
