The image above may look like a fairly normal picture of the night sky, but what you're looking at is a lot more special than just glittering stars. Each of those white dots is an active supermassive black hole.
is devouring material at the heart of a galaxy millions of light-years away – that's how they could be pinpointed at all.
When they're just hanging out not doing much, black holes don't give off any detectable radiation, making them much harder to find. When a black hole is actively accreting material – spooling it in from a disc of dust and gas that circles it much as– the intense forces involved generate radiation across multiple wavelengths that we can detect across the vastness of space.
Because it's based on Earth, LOFAR does have a significant hurdle to overcome that doesn't afflict space-based telescopes: the ionosphere. This is, which can be reflected back into space. At frequencies below 5 megahertz, the ionosphere is opaque for this reason.
France Dernières Nouvelles, France Actualités
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