... Science User Portal . ... ESO, the European Southern Observatory . ... ESO Acronyms . ... European Week of Astronomy and Space Science 2009 . ... The Hubble Space Telescope . ... This image of Hubble is set against a background of hundreds of unique slitless spectra obtained by Hubble. The Space Telescope European Coordinating Facility (ST-ECF) was heavily involved in the development of slitless spectroscopy, which is used to study some of the faintest and most distant objects in the Universe. ...