This section includes scientific and technological news from the IAC and its Observatories, as well as press releases on scientific and technological results, astronomical events, educational projects, outreach activities and institutional events.

  • Ratio between the measured and predicted gravitational redshifts vs. cosmological redshift, zcosm. Main panel: data from the present work. Superior inset: Solar System and Milky Way data from the literature. Inferior inset: galaxy cluster data from the literature (see Figure 1 of the paper).

    We perform a new test of Einstein's Equivalence Principle which, for the first time, extends to very early cosmological epochs (we have studied its validity in 80% of the history of the Universe). The Einstein Equivalence Principle is essential for generalizing physical laws in the presence of gravity. Our test of the Equivalence Principle is based on one of Einstein's classical predictions: the gravitational redshift of photons. This test has been accurately put into practice in our Solar System and in some stars in our Galaxy (e.g. Sirius B). However, so far it has not been applied to

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  • Image taken by the Hubble Space Telescope of the Einstein ring GAL-CLUS-022058s, located in the constellation of Fornax. Credit: ESA/Hubble & NASA, S. Jha; Acknowledgment: L. Shatz

    In December 2020 a team from the European Space Agency (ESA) published an image taken by the Hubble Space Telescope (HST) of GAL-CLUS-022058s, the biggest and one of the most complete Einstein rings discovered, situated towards the southern hemisphere constellation of Fornax. Since then, those observations have been used to develop a model of gravitational lenses which has enabled the study of the physical properties of the amplified galaxies.

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  • Visigoth Basilica of Santa Lucía del Trampal

    Known as the only building from the Visigoth era in the southern half of the Spanish península which is still conserved, this church, from the Municipality of Alcuéscar in the province of Cáceres, is the scene which has been chosen to welcome Autumn by the channel.

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  • Erupción volcánica en Cumbre Vieja (La Palma)

    The IAC expresses the solidarity of all its staff with La Palma in the face of the eruptive phenomenon that is affecting several municipalities on the island. We thank the authorities and all those involved in the security arrangements for the great work they are doing, which has prevented personal injury and has been of great help to the population. We deeply regret the material losses that many of the people living on the island are suffering. The eruption occurred about 20 km in a straight line from the Roque de los Muchachos Observatory and at an altitude of 600 m above sea level, so

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  • Photometer SG-WAS. Credit: Miguel Rodríguez Alarcón (IAC).

    Completely autonomous, not invasive, and low cost. This is the new SG-WAS (SkyGlow Wireless Autonomous Sensor) which will help to measure the impact of artificial night lighting on the natural protected areas of Macaronesia.

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  • Casiana Muñoz Tuñón, deputy director of the IAC

    Between 3rd and 8th October the Conference “Dark and Quiet Skies for Science and Society” will be held in La Palma. It will convene a small group of specialists from throughout the world to suggest solutions to the problems facing Astronomy and citizens in general due to the increase of artificial lighting, the increase in radio signals produced by technological development, and the impact of the recent satellite constellations. Question: What is the objective of this Conference? Reply: In October 2020 the International Astronomical Union (IAU) together with the United Nations’ Office for

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