Related Clues

• Thermometer element
• First rock from the sun
• It falls in winter
• Barometer filler
• Roman God messenger
• 60's space project
• Metallic element
• Planet nearest to the sun
• Liquid metal
• Quicksilver
• With 1-Down, first American astronauts
• Clue for 17-, 27-, 45- and 58-Across
• Nearest planet to the sun
• Closest planet to the sun
• Planet closest to the sun
• Happy to admit copper is a metal
• Planet
• First rock from the Sun - Hg
• Short Hobbit carries copper and quicksilver
• Planet nearest the sun