Neutrinos are as good as massless particles without electrical charge that race through the universe at almost the speed of light. There are an awful lot of them. Every second billions fly through us. We don't notice anything of that, because their properties make them almost uninteracting with our ordinary matter. Neutrinos occur during physical processes in the heart of stars (including our Sun) and in extreme circumstances such as exploding heavy stars and around black holes. They are the only information carriers from those processes that reach us directly. That is why physicists and astronomers are very interested in them. But how do you measure a particle that flies right through everything? And especially: from which direction exactly do they come, so you can determine their source? By using a measuring installation deep in the Mediterranean Sea to look down and use the underlying Earth as a shield for all other particles in the universe. Dr. Aart Heijboer, who works at the National Institute for Subatomic Physics (Nikhef) in Amsterdam, will talk about this almost science fiction-like project. Nikhef is one of the European partners who have developed this neutrino telescope and are now building it.
Lise Low takes care of the music. James van Lidth de Jeude leads the questions and discussion round after the break.
Tickets: Free of charge