Cada vez es más difícil ver las estrellas: detecteron que la contaminación luminica se duplicó en 12 años

Still
Still “debe aumentar mucho la concienciación para que la luz artificial nocturna no se perceiva como algo positivo, sino como el contaminante que really es”, concluded the experts.

The observations made by citizens of all over the world in the last 12 years have confirmed a worrying trend: each time it is more difficult to see the stars porque cada vez hay más luz artificial por la noche, mucha más de la que pensábamos.

Según los datos de un macroestudio sobre contaminazione luminica publicado este jueves en Science, between 2011 and 2022, the brightness of the sky has increased by 9.6 percent of the annual average, that is, twice as much as when the study began and was measured by satellites. Para ponerlo en perspective, el estudio explica que, la contaminación luminica es tal que un niño nacido en una zone donde se veían 250 stars probably vería less than 100 stars in the same place 18 years later.

Desde hace años, en muchos lugares habitados de la Tierra, el cielo nocturno no llega a oscurecerse del todo porque, en su lugar, un crepúsculo artificial causado por la dispersión de luz anthropogénica en la atmosphere lo impide. Este tipo de contaminazione luminica, denominated “skyglow”no solo nos impide ver las estrellas, también tiene un preocupante impacto ambiental.

La contaminación luminica casi se duplicó en 12 años.  This image shows how the Iberian Peninsula is from space (Don Pettit)
La contaminación luminica casi se duplicó en 12 años. This image shows how the Iberian Peninsula is from space (Don Pettit)

Sin embargo, the result is difficult to calculate with exactitude how and how much artificial light has grown, mainly because the satellites do not detect the blue emissions of LED lights that in the last years have been imposed in all types of lighting, especially in public lighting. .

In addition, the satellites are sensitive to the light that is sent to the sky, but they do not capture the lights that are emitted horizontally, such as the announcements and the lighting on the facades, which contribute more to the “skyglow”. Para saber hasta qué punto la contaminación luminica está impidiendo la visión de las estrellas, Christopher Kybafrom the German Center for Research in Geosciences (GFZ) and the Ruhr-Universität Bochum, together with scientists from the research center for optical astronomy NOIRlab (EE.UU.) analyzed 51.351 observations made by citizens between 2011 and 2022.

En un gran ejemplo de Ciudadana Ciencia, Kyba and his team asked for volunteers from all over the world who participated in the project “Globe at Night” in which they had to compare stellar maps of the night sky with what the light pollution allowed them to see in reality. “Unidas, las contributions de todas estas personas funcionaron como una red global de sensores”, underlined Christopher Kyba.

Según los datos de un macroestudio sobre contaminación luminica published this Thursday in Science, between 2011 and 2022, el brillo del cielo ha increased un 9.6 por cento de averageo anual
Según los datos de un macroestudio sobre contaminación luminica published this Thursday in Science, between 2011 and 2022, el brillo del cielo ha increased un 9.6 por cento de averageo anual

The initiative obtained data from 19,262 localities worldwide, including 3,699 localities in Europe and 9,488 localities in North America. Según los resultados, el brillo del cielo nocturno provocado por la luz artificial ha crecido entre un 7 y un 10% al año (lo que equivale al doble de luz en approximately una decade). Sin embargo, según las mediciones hechas por los satellites, la emission de luz artificial solo ha crecido un 2% annually.

This is “resplendor celeste”, apuntan los autores, tiene graves efectos no solo para la observación de estrellas sino también para el medioambiente.

“The ‘skyglow’ affects both diurnal and nocturnal animals, and also destroys an important part of our cultural heritage”, while it has “negative effects for the observation of stars and astronomy”, warned Constance Walker, co-author of the study and head of the Globe al Night project at NOIRlab.

The observations made by citizens of the world in the last 12 years have confirmed a worrying trend: every time it is more difficult to see the stars because every time there is more artificial light at night, much more than what we think
The observations made by citizens of the world in the last 12 years have confirmed a worrying trend: every time it is more difficult to see the stars because every time there is more artificial light at night, much more than what we think

En una Perspectiva relacionadas, Fabio Falchi del Instituto de Ciencia y Tecnología de la Contaminación Lumínica (ISTIL) and Salvador Bará, professor of optics at the Spanish University of Santiago de Compostela, opinan que “the most important message that the scientific community should extract from the study is that the lumina pollution está augamento, a pesar de las medidas que supuestamente se han puesto en marcha para limitarla”.

Aún “debe aumentar mucho la concienciación para que la luz artificial nocturna no se perciba como algo positivo, sino como el contaminante que realente es”, concluded both experts.

Con información de EFE

Seguir leyendo

Leave a Reply

Your email address will not be published. Required fields are marked *