Zeta UMa Observatory

B33 (TOA-130 FIRST IMAGE)

La nebulosa de la Cabeza de Caballo es una nebulosa oscura situada en la constelación de Orión, justo debajo de Alnitak (Zeta Orionis), la estrella más a la izquierda del Cinturón de Orión. Se encuentra a unos 1500 años luz de la tierra. Su brillo rojo procede del gas hidrógeno situado detrás de la nebulosa, ionizado por la brillante estrella Sigma Orionis situada cerca. Su oscuridad se debe a que está formada por capas de polvo interestelar de gran espesor. The Horsehead Nebula (also known as Barnard 33 in bright nebula IC 434) is a dark nebula in the Orion constellation. The nebula is located just below Alnitak, the star furthest left on Orion's Belt, and is part of the much larger Orion Molecular Cloud Complex. It is approximately 1500 light years from Earth. Its shape was first noticed in 1888 by Williamina Fleming on photographic plate B2312 taken at the Harvard College Observatory. The red glow originates from hydrogen gas predominantly behind the nebula, ionized by the nearby bright star Sigma Orionis. The darkness of the Horsehead is caused mostly by thick dust, although the lower part of the Horsehead's neck casts a shadow to the left. Streams of gas leaving the nebula are funneled by a strong magnetic field. Bright spots in the Horsehead Nebula's base are young stars just in the process of forming.
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