... This symmetric cloud dubbed the Boomerang Nebula was created by a high-speed wind of gas and dust blowing from an aging central star at speeds of nearly 600,000 kilometers per hour. ... Earth at Twilight . ... No sudden, sharp boundary marks the passage of day into night in this gorgeous view of ocean and clouds over our fair planet Earth. ... Sharing the night sky seen around the world, this view from Monument Valley, USA includes a picturesque foreground of famous buttes. ... Horizon to Horizon . ...