... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . ... Travel to E-ELT Armazones . ... ESO . ... Survey Telescopes . ... Star Clusters . Stars . ... Stars@ESO . ... Using ESO's Very Large Telescope, astronomers have discovered a rather unusual system, in which two planet-size stars, of different colours, orbit each other. ... 2]: White dwarfs are Earth-size, hot and extremely dense stars that represent the end products of the evolution of solar-like stars. ...