50 years of RGU photometry.
50 Years of Soviet Astronomy
50 years of space science at Leicester
50 years of the Borok Geophysical Observatory, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences
50 years of the Lovell Telescope
50 Years of the Meteoritical Bulletin
50 years of the Moscow astronomical olympiade.
50-100 NM Carbon Balls in Allende Meteorite Morphologically Identical to Nannobacterial Colonies on Earth
50-500 MeV γ-ray emission in the early phase of SN1987A
50-day Oscillation of Length-of-day Change
50-mm MEMS deformable mirror
50-year Analysis of Jupiter's DAM Radio Sources
500 K and Below - Finding Ultracool Dwarfs with the UKIRT/WFCAM and VISTA surveys
500 TeV gamma rays from Hercules X-1
500 to 3000 A Observations of the UX UMa Stars V3885 Sgr, RW Sex, and IX Vel
500 Years Since the Death of Bernard Perger. (Slovenian Title: Ob petstoletnici smrti Bernarda Pergerja)
500-3200 A observations of the interacting binary stars V356 SGR and Beta LYR
500-km 1-GBPS airborne laser link
500-th solution of 2D Ising model
5000 Flying Rocks - Asteroid Positions