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The Horsehead Nebula (also known as Barnard 33 or B33) is a small dark nebula in the constellation Orion. [2] The nebula is located just to the south of Alnitak , the easternmost star of Orion's Belt , and is part of the much larger Orion molecular cloud complex .
IC 434 is a bright emission nebula in the equatorial constellation of Orion.It was discovered on February 1, 1786 by German-British astronomer William Herschel. [2] The nebula is located at a distance of approximately 1,260 ly (385 pc) from the Sun and spans the interior of a neutral hydrogen shell with an angular size of 2° × 4°.
Flame Nebula (NGC 2024) IC 434, which contains the Horsehead Nebula; The Horsehead Nebula (Barnard 33) M78, a reflection nebula (NGC 2068) McNeil's Nebula is a variable nebula discovered in 2004 near M78; Orion East Cloud (LDN 1621 + LDN 1622) HH 24-26 this group contains three Herbig–Haro objects; HH 111 one of the most well-known Herbig ...
The Horsehead Nebula, in the constellation Orion, is 1,300 light-years away. A light-year is nearly 6 trillion miles (9.7 trillion kilometers).
In the lower part of this wide field image the distinct blue eyed Blue Horsehead Nebula can be seen. The blue area at the back of the head is IC 4601 . The cloud in the top left corner is LBN 1093 and Sh2-1 with the bright star being Pi Scorpii and the yellowish cloud in the middle on the left being Sh2-7 with Dschubba at its center.
The size of solid bodies does not include an object's atmosphere. For example, Titan looks bigger than Ganymede, but its solid body is smaller. For the giant planets , the "radius" is defined as the distance from the center at which the atmosphere reaches 1 bar of atmospheric pressure.