By Hugh Zackheim | Elkhorn Mountains near Townsend, Montana, USA

By Idriss Dhoparee | London/England

By Idriss Dhoparee | London/England

By Nahum Garcia | Teide National Park, Tenerife, Spain

By Chuck Reinhart | Vincennes Indiana

By Dennis Schoenfelder | Alamosa County , Colorado

By Sanketh Hiremath | Spiti, Himachal Pradesh, India

By Dr Ski | Valencia Coconut Planetation

By Dr Ski | Valencia Observatory

By Dr Ski | Valencia Observatory

By Jose Zarcos Palma | Mina São Domingos,Portugal

By Tom Marsala | Menifee, Calif

By Kent and Carolyn Carlson | Little Horseshoe Park, Rocky Mountain National Park, CO

By Deborah Allen | Driving south on Route 95 outside Richmond VA

By Dr Ski | Valencia Observatory

By Dr Ski | Valencia Observatory