jueves, 22 de septiembre de 2016

LA METAMORFOSIS DE LA NEBULOSA DE LA LAGUNA ( M8 )


Like a Dali masterpiece, this image of Messier 8 from the NASA/ESA Hubble Space Telescope is both intensely colourful and distinctly surreal. Located in the constellation of Sagittarius (The Archer), this giant cloud of glowing interstellar gas is a stellar nursery that is also known as the Lagoon Nebula. Although the name definitely suits the beauty of this object, “lagoon” does suggest tranquillity and there is nothing placid about the high-energy radiation causing these intricate clouds to glow. The massive stars hiding within the heart of the nebula give off enormous amounts of ultraviolet radiation, ionising the gas and causing it to shine colourfully, as well as sculpting the surrounding nebula into strange shapes. The result is an object around four to five thousand light-years away which, on a clear night, is faintly visible to the naked eye. Since it was first recorded back in the 1747 this object has been photographed and analysed at many different wavelengths. By using infrared detectors it is possible to delve into the centre of these dusty regions to study the objects within. However, while this optical image, taken with the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope, cannot pierce the obscuring matter it is undoubtedly one of the most visually impressive. Messier 8 is an enormous structure — around 140 by 60 light-years in extent — to put this in perspective the orbit of Neptune stretches only about four light-hours from our own Sun. This image depicts a small region in the centre of the nebula, while the region adjacent to the Lagoon Nebula, from the same Hubble observations, can be seen here. This picture was created from exposures taken with the Wide Field Channel of the Advanced Camera for Surveys on Hubble. Light from glowing hydrogen (through the F658N filter) is coloured red. Light from ionised nitrogen (through the F660N filter) is coloured green and light through a yellow filter (F550M) is coloured blue. The exposu

La gigantesca nube de gas interestelar que se ve en la imagen es una guardería de estrellas, está ubicada a 5.000 años luz de distancia en la constelación de Sagitario y es conocida como la Nebulosa de la Laguna o Messier 8. Las estrellas masivas ocultas en el corazón de esta nebulosa emiten enormes cantidades de radiación ultravioleta, ionizando el gas circundante haciéndolo brillar. El viento estelar esculpe las nubes de gas cambiando constantemente sus formas.
La Nebulosa de la Laguna fue observada por primera vez en 1747 y ha sido fotografiada en diferentes longitudes de onda. Al usar detectores infrarrojos es posible observar los objetos escondidos detrás de las densas capas de polvo. Esta imagen, tomada por el Telescopio Espacial Hubble en luz visible, muestra una pequeña región en el centro de la nebulosa.
Crédito: NASA / ESA / Hubble
FUENTE

La metamorfosis de la Nebulosa de la Laguna (M8)


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