Imagine you are living on a planet belonging to a double star system. When the first star is descending below the horizon, the other one keeps on shining brightly in the evening sky. Also double sunrises and sunsets are possible when the separation between both stars is relatively small on the sky. For a long time, this scenario belonged to science fiction only, but today we already know some worlds where one could indeed observe this fascinating celestial spectacle...

A team of researchers from institutes all over the world and led by Mariano Moles (Instituto de Astrofísica de Andalucía, CSIC), is currently undertaking a large scale survey (the ALHAMBRA survey) at Calar Alto that will reveal 90% of the history of the Universe. The team has just made public an impressive colour image that reveals the prospects of this work...

Open star cluster M45, the Pleiades, is popularly known as "The Seven Sisters". However, it is well-known that this group of young and nearby stars is composed not by just seven stars, but by about one thousand of them. A recent study of this cluster has discovered the faintest and coolest known members known to date: they are the Pleiades' lesser sisters, a group of the low-mass objects known as brown dwarfs...