We are pleased to invite you to a talk (at physics undergraduate level) by Dr Mark Sullivan‚ University of Oxford‚ entitled “The Transient Universe: Dark Energy and Cosmic Explosions” at 12.30pm on 4 April in Physics Lecture Theatre C (46/2005). Mark is one of the UK’s leading figures in the use of facilities such as the Palomar Transient Factory, which is using supernovae to constrain the properties of Dark Energy.