Related Clues:

• Saturn, for one
• Astronomer's sighting
• 5-Down, for example
• Word on a U.S. coin
• See 24-Across
• Sun circler
• Word on all U.S. coins
• Vulcan, for one
• 'Oh wow!'
• Jupiter, e.g.
• Saturn or Mercury
• King of Kings
• ___ ex machina
• 'My ___!'
• See 42-Down