From the point of view of radiation safety, interstellar space is not empty. Neutral and ionized interstellar gas and cosmic rays consisting of H and He-nucleons constitute radiation hazard aboard relativistic interstellar ships. Relativistic aberration of cosmic rays is evaluated and radiation doses from oncoming relativistic flow of interstellar gas and cosmic rays are estimated. Necessary sh...

Context. Ionized gas probes the influence of massive stars on their environment. The Cygnus X region ( d ~ 1.5 kpc) is one most star-forming complexes in our Galaxy, within which Cyg OB2 association (age 3–5 Myr and stellar mass 2 × 10 4 M ? ) has a dominant influence. Aims. We observe at 148 MHz using Low Frequency Array (LOFAR) take short-spacing information into account during image deconvol...