Astronomers have spotted the X-ray flash that precedes a nova. The brief flare is the first sign of a white dwarf erupting into a nuclear-fusion fireball.
Summer only lasts so long. Like everything, it's transient. That will be our theme as we explore wispy noctilucent clouds, a nova that can't sit still, and a supernova in NGC 5427 in Virgo.
In a rare move, a sleepy cataclysmic variable blows its top and suddenly becomes a nova.
Between the discovery of the new comet ASASSN1 and two stellar explosions, there's a lot happening in the sky this week. Take your telescope out and see what all the excitement's about.