From the Latin 'nebula' (cloud), clouds of gas and dust among the stars, nebulae are both active nurseries and cemeteries of stars. These splendors of the sky are lit by the stars they contain or by the nearby stars located behind them. These are the most beautiful astronomy images that can currently be obtained. The nebulae allow us to admire in the field of the telescope marvelous agglomerations of stars and gases flooding the sky. Only long exposures will reveal the entire palette of colors, in particular the astonishing pink color of hydrogen.
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The Eagle Nebula: Stellar Nursery and Pillars of Creation 
Composition of Interstellar Dust 
Heart and Soul Nebulae: Giant H II Regions 
Interstellar Clouds: The Dark Forests of the Galaxy 
The Black River: Dark Silhouette of the Milky Way 
Nebula NGC 3603: One of the Largest Massive Star Factories 
The Cone Nebula and the Christmas Tree Cluster: A Stellar Nursery in the Making 
The Tarantula Nebula: A Cosmic Jewel 
The Rosette Nebula: A Stellar Nursery in Full Bloom 
NGC 346: A Stellar Nursery in the Small Magellanic Cloud 
Nebula NGC 2170: A Kaleidoscope of Dust and Light 
The Helix Nebula: When a Star Dies 
Nebulae: Cosmic Clouds of Gas and Dust 
The Witch Head Nebula: Phantom of the Cosmos 
Diffuse, Dark, and Planetary Nebulae: A Physical Classification 
Carina: A Nebula More Active than the Horsehead and Orion Combined? 
The Orion Nebula: A Stellar Nursery 
The Crab Nebula M1: Remnant of a Historical Supernova 
Planetary nebulae 
The light and dark of nebulae 
Coatlicue: The Mother Nebula of the Sun and the Solar System