In the centres of the Milky Way and M83, the global environmental properties thought to control star formation are very similar. However, M83's nuclear star formation rate (SFR), as estimated by synchrotron and H α emission, is an order of magnitude higher than the Milky Way's. To understand the origin of this difference we use ALMA observations of

Context. Stellar activity poses one of the main obstacles for the detection and characterisation of small exoplanets around cool stars, as it can induce radial velocity (RV) signals that can hide or mimic the presence of planetary companions. Several indicators of stellar activity are routinely used to identify activity-related signals in RVs, but

Twenty-five years ago, enigmatic linear polarization signals were discovered in the core of the sodium D 1 line. The only explanation that could be found implied that the solar chromosphere is practically unmagnetized, in contradiction with other evidences. This opened a paradox that has challenged physicists for many years. Here we present its

Se presentan las principales características del SG-WAS (Sensor Autónomo Inalámbrico SkyGlow), un dispositivo low-cost para medir el brillo del cielo nocturno (NSB). El SG-WAS está basado en el sensor TSL237 -como el Unihedron Sky Quality Meter (SQM) o el STARS4ALL Telescope Encoder and Sky Sensor (TESS)-, con comunicación inalámbrica (LoRa, WiFi o

Aims: Dust in spiral galaxies produces emission in the far-infrared (FIR) and internal absorption in visible wavelengths. However, the relation of the two amounts is not trivial because optical absorption may saturate, but the FIR emission does not. Moreover, the volume concentration of dust plays a role in the relation of absorption and emission