By Jelieta Walinski Ph.D | Desert Bloom Observatory, AZ, USA

By Patricio Leon | Santiago, Chile

By Helio de Carvalho Vital | Saquarema, Rio de Janeiro, Brazil

By Frank Lu | Arlington, Texas, USA

By Robert Strickler | Spartanburg, SC, USA

By Caroline Haldeman | Flagstaff, AZ, USA

By Mario Rana | Hampton, Virginia

By JOSE PALMA | Ourique-Portugal

By Mohammed Abdallah | Suez, Egypt

By Cynthia Trosin | Chesterfield Township MI USA

By Asha Prasad | Minnesota, USA

By juan manuel pérez rayego | Montánchez, Spain

By Ernest Jacobs | North Java, NY, USA

By Kevan Hubbard | Teesmouth Nature Reserve,Co Durham, England

By Mandy Daniels | Derbyshire, UK

By Cecille Kennedy | Depoe Bay, Oregon