By Patricio Leon | Santiago, Chile

By Hassan Dadashi . Arani | Esfahan province. Iran

By Nina Gorenstein | West Lafayette, IN, USA

By Ross Stone | Owens Valley Radio Observatory

By Zephirina Bothello | San Jose, California

By Peter Lowenstein | Mutare, Zimbabwe

By Hassan Dadashi . Arani | Esfahan province. Iran

By Nina Gorenstein | West Lafayette, IN, USA

By Gontran e | Caracas, Venezuela

By Patricio Leon | Santiago, Chile

By Denise Kleinschmidt | Aruba

By Jennifer J. Wilhoit | Bainbridge Island, WA USA

By Hassan Dadashi . Arani | Esfahan province. Iran

By Lynzie Flynn | San Dimas, California

By Mandy Daniels | Derbyshire, UK

By David Hoskin | Halifax, Nova Scotia, Canada