Scientists pick up shock waves from colliding galaxies - BBC News

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Scientists have picked up shock waves from the orbit of supermassive black holes at the heart of distant galaxies as they begin to merge.

This may be the first direct evidence of giant black holes distorting space and time as they spiral in on each other.

The theory is that this is how galaxies grow. Now astronomers may soon be able to watch it happen.

These distortions are happening all the time, all across the Universe.