Result: What would the sky look like at long radio wavelengths ?

At wavelengths of about 10 meters the appearance of the sky is dominated by the intense synchrotron background radiation of the Galaxy. Several ionized-Hydrogen regions in the Galaxy make their appearance as discrete absorption features seen against this intense background radiation. Some of the Galactic supernova remnants are resolved even at moderate resolutions (∼0.°5) of most of the existing long-wavelength sky surveys. Away from the Galactic plane a large number of extragalactic sources are seen, most of which are unresolved at this resolution and are identified with radio galaxies and quasars while a very small fraction of them are due to clusters of galaxies. Only a couple of these sources are millisecond pulsars seen as continuum sources in the confusion-limited long wavelength surveys. At the resolution (∼ 20) and sensitivity (∼ 1 mJy/beam) that the Low Frequency Space Array is expected to achieve at wavelengths of about 10 meters, most of the supernova remnants, ionized-Hydrogen regions, halos in near-by clusters and halos around galaxies should be resolved. An all-sky survey carried out by the Space Array is expected to be at least two orders of magnitude more sensitive compared to the existing large scale sky surveys. A large population of millisecond pulsars might be detectable as continuum sources in such a survey. At wavelengths much longer than 10 meters, the Galaxy is no longer optically thin and at about 100 meters wavelength even the Warm Ionized Medium becomes optically thick for a path length of about 2 kpc. Hence, at such long wavelengths, the Galactic radio emission from only the solar neighborhood would be detectable. Observations in the wavelength range of 10 to 100 meters can thus lead to a 'tomographic' study of the Galaxy.