Continuous radiation from stars. Spectral lines and their formation. Telescopes and other detectors. Basic ideas of special relativity. Binary stars and stellar parameters. Stellar atmospheres and radiation transport. Main sequence stars and their structure. Nuclear processes in stars. End points of stellar evolution. Black holes. Interstellar medium and star formation. Clusters of stars. Galaxies. The Universe on large scales. Cosmological models for a homogeneous isotropic Universe. The early Universe.