Pluto and Eris are icy dwarf planets with nearly identical sizes, comparable densities and similar surface compositions as revealed by spectroscopic studies. Pluto possesses an atmosphere whereas Eris does not; the difference probably arises from their differing distances from the Sun, and explains their different albedos. Makemake is another icy

In this review, we look back upon the literature, which had the GREGOR solar telescope project as its subject including science cases, telescope subsystems, and post-focus instruments. The articles date back to the year 2000, when the initial concepts for a new solar telescope on Tenerife were first presented at scientific meetings. This

La formación estelar es el factor más importante que controla la evolución de las galaxias, con la posible excepción de la interacción galaxia-galaxia, y se ha convertido en uno de los campos más investigados y discutidos en la astronomía actual. Los detalles de la interacción entre el contenido de gas de las galaxias y los procesos que disparan la

El proyecto MASGOMAS (``MAssive Stars in Galactic Obscured MAssive clusterS'') tiene como objetivo descubrir, observar y caracterizar físicamente cúmulos jóvenes, masivos (varios miles de masas solares) y altamente enrojecidos, pertenecientes a nuestra Galaxia, en especial aquellos cuya masa total excede 10000 masas solares. Estos cúmulos, de los

We study for the first time the environment of massive black hole (BH) seeds (˜104-5 M⊙) formed via the direct collapse of pristine gas clouds in massive haloes (≥107 M⊙) at z > 6. Our model is based on the evolution of dark matter haloes within a cosmological N-body simulation, combined with prescriptions for the formation of BH along with both