... Credit Copyright: M ximo Ruiz Explanation: This cosmic expanse of dust, gas, and stars covers close to 3 degrees on the sky in the heroic constellation Perseus . ... Other reflection nebulae are scattered around, along with remarkable dark dust nebulae. Near the edge of a large molecular cloud , they tend to hide the newly formed stars and young stellar objects or protostars from prying optical telescopes. ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...