X Ray Stars and Winds in the Rosette Nebula . ... NASA Explanation: This mosaic of x-ray images cuts a swath across the photogenic Rosette Nebula, a stellar nursery 5,000 light-years from Earth in the constellation Monoceros, the Unicorn . Constructed from data recorded by the orbiting Chandra X-ray Observatory , the mosaic spans less than 100 light-years and is color coded to show low energies in red and high energy x-rays in blue. ... NASA Web Site Statements, Warnings, and Disclaimers . ...