BBC Mundo - Ciencia y Tecnolog铆a - Fotos de las misteriosas olas del cielo

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Poco se sabe de ellas, pero el astr贸nomo aficionado John Rowlands y su mentor, el profesor Nick Mitchell de la Universidad de Bath, se dedican a observarlas y aqu铆 comparten con la BBC sus im谩genes y comentarios. (Im谩genes cortes铆a de John Rowlands y Nick Mitchell). </div> </div> </div> </li> <li> <div class="box bx-picture i-w926 i-h521"> <div class="content"> <div class="module "><a href="https://web.archive.org/web/20100722002644/http://wscdn.bbc.co.uk/worldservice/assets/images/2010/07/19/100719154719_sp_nubes2_926x521.jpg"><img src="https://web.archive.org/web/20100722002644im_/http://www.bbc.co.uk/worldservice/ic/106x60/wscdn.bbc.co.uk/worldservice/assets/images/2010/07/19/100719154719_sp_nubes2_926x521.jpg" width="106" height="60" alt="Copyright: John Rowlands"/></a></div> <div class="body">Son las nubes m谩s ex贸ticas que se pueden ver. Su nombre significa "noche brillante" y la raz贸n por la cual se ven de noche es porque est谩n tan arriba que les sigue dando la luz del Sol, incluso despu茅s del atardecer. De hecho, s贸lo se pueden ver en el ocaso, en verano y mirando hacia el norte. (Im谩genes cortes铆a de John Rowlands y Nick Mitchell).</div> </div> </div> </li> <li> <div class="box bx-picture i-w926 i-h521"> <div class="content"> <div class="module "><a href="https://web.archive.org/web/20100722002644/http://wscdn.bbc.co.uk/worldservice/assets/images/2010/07/19/100719154725_sp_nubes_926x521.jpg"><img src="https://web.archive.org/web/20100722002644im_/http://www.bbc.co.uk/worldservice/ic/106x60/wscdn.bbc.co.uk/worldservice/assets/images/2010/07/19/100719154725_sp_nubes_926x521.jpg" width="106" height="60" alt="Copyright: John Rowlands"/></a></div> <div class="body">Alcanzan a estar a 85 kil贸metros de altura, ocho veces m谩s que las nubes m谩s altas de todas, as铆 que realmente est谩n en el borde del Espacio. Estas misteriosas olas celestes plateadas y azules se aprecian en todo su esplendor desde el cementerio de la iglesia de St Patrick, en la costa norte de Anglesey, Gales. (Im谩genes cortes铆a de John Rowlands y Nick Mitchell).</div> </div> </div> </li> <li> <div class="box bx-picture i-w926 i-h521"> <div class="content"> <div class="module "><a href="https://web.archive.org/web/20100722002644/http://wscdn.bbc.co.uk/worldservice/assets/images/2010/07/19/100719154722_sp_nubes3_926x521.jpg"><img src="https://web.archive.org/web/20100722002644im_/http://www.bbc.co.uk/worldservice/ic/106x60/wscdn.bbc.co.uk/worldservice/assets/images/2010/07/19/100719154722_sp_nubes3_926x521.jpg" width="106" height="60" alt="Copyright: John Rowlands"/></a></div> <div class="body">La iglesia de St Patrick es un lugar maravilloso, ideal para observar el cielo con claridad: cuando en el horizonte no hay m谩s que mar, no hay contaminaci贸n lum铆nica. (Im谩genes cortes铆a de John Rowlands y Nick Mitchell).</div> </div> </div> </li> <li> <div class="box bx-picture i-w926 i-h521"> <div class="content"> <div class="module "><a href="https://web.archive.org/web/20100722002644/http://wscdn.bbc.co.uk/worldservice/assets/images/2010/07/19/100719161022_sp_nubes-5_926x521.jpg"><img src="https://web.archive.org/web/20100722002644im_/http://www.bbc.co.uk/worldservice/ic/106x60/wscdn.bbc.co.uk/worldservice/assets/images/2010/07/19/100719161022_sp_nubes-5_926x521.jpg" width="106" height="60" alt="Copyright: John Rowlands"/></a></div> <div class="body">Estas nubes dan pistas sobre el cambio clim谩tico: se piensa que el incremento en su actividad es consecuencia de variaciones a largo plazo en la mes贸sfera, la parte de la atm贸sfera en la que ocurre este fen贸meno nocturno. (Im谩genes cortes铆a de John Rowlands y Nick Mitchell).</div> </div> </div> </li> <li> <div class="box bx-picture i-w926 i-h521"> <div class="content"> <div class="module "><a href="https://web.archive.org/web/20100722002644/http://wscdn.bbc.co.uk/worldservice/assets/images/2010/07/19/100719161228_sp_nubes-6_926.jpg"><img src="https://web.archive.org/web/20100722002644im_/http://www.bbc.co.uk/worldservice/ic/106x60/wscdn.bbc.co.uk/worldservice/assets/images/2010/07/19/100719161228_sp_nubes-6_926.jpg" width="106" height="60" alt="Copyright: John Rowlands"/></a></div> <div class="body">Las noctilucentes son muy variables: algunas noches est谩n en el cielo y otras desaparecen por completo, y no se sabe de qu茅 depende que esto ocurra... Probablemente tiene algo que ver con las propiedades de la atm贸sfera. (Im谩genes cortes铆a de John Rowlands y Nick Mitchell).</div> </div> </div> </li> <li> <div class="box bx-picture i-w926 i-h521"> <div class="content"> <div class="module "><a href="https://web.archive.org/web/20100722002644/http://wscdn.bbc.co.uk/worldservice/assets/images/2010/07/19/100719162200_sp_nubes-7_926x521.jpg"><img src="https://web.archive.org/web/20100722002644im_/http://www.bbc.co.uk/worldservice/ic/106x60/wscdn.bbc.co.uk/worldservice/assets/images/2010/07/19/100719162200_sp_nubes-7_926x521.jpg" width="106" height="60" alt="Copyright: John Rowlands"/></a></div> <div class="body">La evidencia anecd贸tica es que estas nubes se ven hoy en d铆a m谩s brillantes y aparecen m谩s a menudo en el cielo nocturno, pero esto a煤n no ha sido comprobado cient铆ficamente. 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