... Tonight's Sky . ... Observing springtime deep-sky objects with a large telescope . ... Fermi space telescope explores new energy extremes . ... New sources emerge and old sources fade as the LAT's view extends into higher energies. ... After more than three years in space, NASAт??s Fermi Gamma-ray Space Telescope is extending its view of the high-energy sky into a largely unexplored electromagnetic range. This week, the Fermi team announced its first census of energy sources in this new realm. ...