... Credit Copyright: Maurice Toet , Steve Loughran , Darren Jehan Tim Jardine Explanation: The dark Horsehead Nebula and the glowing Orion Nebula are contrasting cosmic vistas. ... The familiar Horsehead nebula appears as a dark cloud, a small silhouette notched against the long red glow at the lower left. ... Below Alnitak is the Flame Nebula , with clouds of bright emission and dramatic dark dust lanes. ... Publications with keywords: Horsehead Nebula - Orion Nebula - interstellar medium . ...