The public's "right to starlight" is steadily being eroded by urban illumination that is the bane of astronomers everywhere, the International Astronomical Union said on Friday. The body, which wrapped up an 11-day general assembly in Rio de Janeiro that attracted galaxy-gazers from around the world, argued that authorities should use more unobtrusive lighting in cities and towns. Such moves would not only free up the night skies to make for easier viewing but also promote environmental protection, energy savings and tourism, it said in a resolution. "The progressive degradation of the night sky should be regarded as a fundamental...