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Black-hole eclipse sizes up X-ray source The eclipse of a supermassive black hole has allowed astronomers to make the first direct measurement of the size of the disk-shaped X-ray source that surrounds these celestial bodies. The event occurred when a gas cloud moved across the supermassive black hole that lies at the centre of NGC 1365 galaxy -- which is about 60 million light years from Earth -- temporarily obscuring X-rays emitted by the disk.
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