Related Clues:

• Cataclysmic nuclear explosion
• TV science series
• Most definitely not leading Virginia to become a bright star
• Popular PBS series
• Cosmic cloud
• Series with a ''Secrets of the Sun'' episode
• Faint star that suddenly flares into brightness and then fades again
• Long-running PBS show
• Sungrazer, e.g
• One is named after Edmond Halley
• Kind of lox
• There's no escaping this
• Halley's ___
• Astronomical cloud
• Long-running PBS science series