The Fermi Gamma-ray Space Telescope - A particle detector in space Abstract: The Fermi Gamma-ray Space Telescope is a joint NASA/DOE mission that was launched two years ago. The main detector component of the Fermi LAT is a tracker made of Silicon Strip detectors. In this talk I will describe the instrument and highlight the differences and similarities to the LHCb inner tracker. I will give an overview over the collected gamma-ray data and explain the different types of sources that are detected. The main focus will be on pulsars (spinning neutron stars). I will describe how pulsars can be discovered in a Òblind frequency searchÓ and how Fermi has changed our knowledge about these exotic objects.