NGC 2261 – Hubble’s Variable Nebula NGC 2261, known as Hubble’s Variable Nebula, is a reflection nebula located in the constellation of Monoceros (the Unicorn). Its characteristic fan-shaped form is illuminated by the young star R Monocerotis (R Mon), located at one of its ends. The light from this star is reflected by the dust
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M16 – The Eagle Nebula and the Pillars of Creation M16, popularly known as the Eagle Nebula, is an extensive star-forming region located in the constellation of Serpens. Within it lies one of the most recognizable structures in modern astronomy: the Pillars of Creation, enormous columns of interstellar gas and dust that are undergoing erosion
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NGC 7465 – An Active Galaxy in Interaction NGC 7465 is a galaxy located in the constellation of Pegasus, at a distance of approximately 22 Mpc, equivalent to about 72 million light-years. SIMBAD currently classifies it as a Seyfert 2 galaxy, although near-infrared spectroscopic studies have found evidence that led to its classification as a
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NGC 2244 – The Young Star Cluster at the Heart of the Rosette Nebula NGC 2244 is a very young open star cluster located in the constellation of Monoceros, at the center of the famous Rosette Nebula. The cluster is composed of a population of young, massive stars that ionize the surrounding gas and play
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Abell 2197 – A Galaxy Cluster in the Hercules Supercluster Abell 2197 (ACO 2197) is a galaxy cluster located in the constellation of Hercules, at a distance of more than 400 million light-years. It has a relatively irregular structure and lies approximately 1.5° north of Abell 2199 on the sky. Both clusters have similar redshifts
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Arp 227 – The Shell Galaxy Arp 227 is one of the most interesting galactic structures in the constellation of Pisces. The designation refers to NGC 474, a lenticular galaxy surrounded by a spectacular system of faint stellar shells, arcs, and tidal structures extending around its main body. NGC 474 forms a system with the
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IC 434 – The Horsehead Nebula IC 434, popularly known as the Horsehead Nebula, is an emission region located in the constellation of Orion, within the Orion molecular cloud complex. The dark silhouette that gives the object its name actually corresponds to Barnard 33 (B33), a cold, dark cloud of gas and dust projected against
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NGC 6888 – The Crescent Nebula NGC 6888, popularly known as the Crescent Nebula and also designated Caldwell 27, is an emission nebula located in the constellation of Cygnus, approximately 4,700 light-years from Earth. It was discovered by William Herschel in 1792. Unlike a planetary nebula, NGC 6888 is a Wolf-Rayet nebula, formed by the
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NGC 6210 – The Turtle Nebula NGC 6210, popularly known as the Turtle Nebula, is a planetary nebula located in the constellation of Hercules, at an estimated distance of 6,000 to 6,500 light-years from Earth. It was discovered by William Herschel on May 25, 1799, and is one of the brightest planetary nebulae in the
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NGC 6445 – The Box Nebula NGC 6445, popularly known as the Box Nebula, is a planetary nebula located in the constellation of Sagittarius, at an estimated distance of 4,000 to 5,000 light-years from Earth. It was discovered by William Herschel on May 28, 1786, and is one of the most remarkable examples of a
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