1. Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992)
   - Oort

Type of: astronomer, stargazer, uranologist

• Helix aspersa
• Helix hortensis
• Helix pomatia
• hell
• hell dust
• hell on earth
• hell raising
• hell to pay
• Hell's Half Acre
• Hell's Kitchen
• hell-bent
• hell-for-leather
• hell-kite
• hell-rooster
• Helladic
• Helladic civilisation
• Helladic civilization
• Helladic culture
• hellbender
• hellbound
• hellcat
• hellebore
• helleborine
• Helleborus
• Helleborus foetidus