425 years ago, a "new" star flared to life near the neck of Cygnus, the swan. Known as P Cygni, it slowly faded, then flared twice more during the 17th century, and has stayed visible ever since. It is roughly 600,000 times the Sun's brightness.
425 years ago, a "new" star flared to life near the neck of Cygnus, the swan. Known as P Cygni, it slowly faded, then flared twice more during the 17th century, and has stayed visible ever since. It is roughly 600,000 times the Sun's brightness.