Galaxy formation entails the hierarchical assembly of mass, along with the condensation of baryons and the ensuing, self-regulating star formation. The stars form a collisionless system whose orbit distribution retains dynamical memory that can constrain a galaxy's formation history. The ordered-rotation dominated orbits with near maximum circularity λz≃1 and the random-motion dominated orbits with low circularity λz≃0 are called kinematically cold and kinematically hot, respectively. The fraction of stars on `cold' orbits, compared to the fraction of stars on `hot' orbits, speaks directly

Ayer se presentó en La Laguna el proyecto educativo que durante los próximos dos cursos llevará esta muestra por todos los centros de Canarias que quieran acercar la Astronomía al alumnado a través de imágenes celestes, formando previamente a docentes interesados.

We present a photometric detection of the first brightness dips of the unique variable star KIC 8462852 since the end of the Kepler space mission in 2013 May. Our regular photometric surveillance started in 2015 October, and a sequence of dipping began in 2017 May continuing on through the end of 2017, when the star was no longer visible from Earth. We distinguish four main 1%–2.5% dips, named “Elsie,” “Celeste,” “Skara Brae,” and “Angkor,” which persist on timescales from several days to weeks. Our main results so far are as follows: (i) there are no apparent changes of the stellar spectrum

An international team of astronomers uses the infrared camera on the Gran Telescopio Canarias to produce, for the first time, a high resolution map of the magnetic field in the clouds of gas and dust particles around the centre of our Galaxy.

Its very low content of metals, and specifically of carbon, put in question the current models of low mass star formation in the early universe.

Its very low content of metals, and specifically of carbon, put in question the current models of low mass star formation in the early universe