The European Space Agency (ESA) is Europe’s gateway to space. Its mission is to shape the development of Europe’s space capability and ensure that investment in space continues to deliver benefits to the citizens of Europe and the world.
Find out more about space activities in our 23 Member States, and understand how ESA works together with their national agencies, institutions and organisations.
Exploring our Solar System and unlocking the secrets of the Universe
Go to topicProtecting life and infrastructure on Earth and in orbit
Go to topicUsing space to benefit citizens and meet future challenges on Earth
Go to topicMaking space accessible and developing the technologies for the future
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Blazars are a type of active galaxy with one of its jets pointing toward Earth. In this artistic rendering, a blazar emits both neutrinos and gamma rays, like in the case of the IceCube-170922A event, recorded on 22 September 2017. On this occasion, the IceCube Neutrino Observatory at the South Pole detected a neutrino while at the same time gamma rays, coming from the same direction in the sky, were detected by other telescopes on Earth and in space.
ESA's INTEGRAL gamma-ray observatory was part of the international collaboration that observed this source. While it did not record any prompt burst of gamma rays from this blazar nor observed it to be in a flaring state, this non-detection provided important information to help constrain the properties of the source.