Observational constraints on the physics behind the evolution of AGN since z ~ 1

Observational constraints on the progenitor metallicities of core-collapse supernovae

Observational constraints on the redshift evolution of X-ray scaling relations of galaxy clusters out to z ~ 1.5

Observational Constraints on Visser's Cosmological Model

Observational Constraints to Ricci Dark Energy Model by Using: SN, BAO, OHD, fgas Data Sets

Observational Cosmology And The Cosmic Distance Duality Relation

Observational difference between gamma and X-ray properties of optically dark and bright GRBs

Observational Evidence Against Long-Lived Spiral Arms in Galaxies

Observational evidence for AGNs feedback at parsec scale

Observational evidence for stellar mass binary black holes and their coalescence rate

Observational evidence for the link between the variable optical continuum and the subparsec-scale jet of the radio galaxy 3C 390.3

Observational Evidence of AGN Feedback

Observational evidence of quasar feedback quenching star formation at high redshift

Observational Evidence of the Accelerated Expansion of the Universe

Observational information for f(T) theories and Dark Torsion

Observational Limits on Patchy Reionization: Implications for B-modes

Observational Limits on Type 1 AGN Accretion Rate in COSMOS

Observational Probes of Cosmic Acceleration

Observational Probes of Dark Energy

Observational properties of diffuse radio sources in Galaxy Clusters. Current knowledge and open questions