An international team of astronomers has found that M31N 2008-12a, a frequently erupting ‘nova’ located in the Andromeda Galaxy, is surrounded by a 400-light-year-wide super-remnant. Larger than almost all known remnants of even supernova explosions, the existence of this super-remnant demonstrates that M31N 2008-12a has erupted with high frequency for millions of years. The Steward 2.3-m Bok Telescope image of M31N 2008-12a and its surrounding...
