Polarization measurements of X-ray radiation from a blazar.
Most of the 200 billion galaxies in the Universe are centred around enormous black holes that can weigh as much as one billion Suns. Many of these black holes are dormant, but some are still growing, devouring gas from their surroundings and releasing vast amounts of radiation.
Even fewer of these active supermassive black holes are capable of launching powerful jets from their cores — ultrafast streams of particles that shine brightly, and can travel distances of up to 100 times the size of their own galaxy. But what provides the initial kick that enables these particles to release so much energy?
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