Related Clues:

• Butter substitute?
• Weaponry
• Aims (for)
• Rotating bodies
• See 31-Across
• Revs
• Names hidden in 20-, 28-, 46- and 54-Across
• Theme of the puzzle
• Orrery parts
• Spear and squirt
• Water and cap, for two
• They have stars around them
• Magazine contents
• Heavenly bodies
• Lethal weapons