By Harshwardhan Pathak | El Sauce Observatory, Chile

By Hassan Dadashi . Arani | Esfahan province. Iran

By Martin Curran | Cheyenne, WY USA

By Helio C. Vital | Saquarema, Rio de Janeiro, Brazil

By Anshuman Saikia | Golaghat, Assam, India

By Hassan Dadashi . Arani | Esfahan province. Iran

By Stephen Bloodsworth | Silver Spring, Maryland USA

By Brenda J. | Tacoma, Washington, United States

By Bob Park | Kinnelon, NJ, USA

By Cecille Kennedy | Depoe Bay, Oregon

By Nina Gorenstein | West Lafayette, IN, USA

By roberto porto | teide national park, Tenerife

By Wes Inman | Torrington Ct

By Hassan Dadashi . Arani | Esfahan . Iran

By Sudhir Sharma | Stormville, NY

By Jeremy Likness | Rocky Creek Lookout, Depoe Bay, OR, USA