Related Clues:

• A source of space of radio signals
• Bright patch in the sky caused by distant galaxy
• It orbits the sun and has a tail
• Small extraterrestrial body
• Object in space with bright centre and long hazy tail
• Mass of interstellar gas
• A star that suddenly becomes brighter for a while
• Heavenly body with a fiery tail
• Mist of gas or stars in the night sky
• Star that suddenly becomes brighter for a time
• Extraterrestrial body
• Star that explodes and becomes extremely luminous
• Orbiting extraterrestrial body
• 'Region of space from which nothing can escape (5,4)'
• A pop star