20m laser interferometer in Kamioka Mine

20th ITT (Internationales Teleskop Treffen)/20. ITT (Internationales Teleskop Treffen)

21 Centimeter Absorption at z = 0.395 in the Quasar 1229-021

21 Centimeter H I Line Observations of the Cygnus Loop

21 centimeter line width distances of cluster galaxies and the value of H0

21 centimeter observations of supercluster galaxies - The bridge between Coma and A1367

21 centimeter study of spiral galaxies in clusters. III - Neutral gas content, star formation, and radio continuum properties

21 centimeter study of spiral galaxies in the Coma supercluster

21 centimeter study of spiral galaxies in the Coma supercluster. II - Evidence for ongoing gas stripping in five cluster galaxies

21 centimeter survey of luminous infrared galaxies

21 CM flux density measurements of sources from the NRAO-MPIfR 6 CM surveys

21 cm HI Absorber in the Outer Disk & Halos of Galaxies

21 CM observations of hot neutral intercloud gas

21 cm radiation: A new probe of fundamental physics

21 Cm Tomography With the Alfalfa Survey

21 Lutetia spectral modeling of near-IR region

21 Lutetia: Groundbased Near-infrared Spectroscopy Prior The Rosetta Flyby

21 neue Verändrliche

21 Supernova Discoveries

21-cm absorption observations towards a cold diffuse cloud