Our galaxy and its nearest large companion, Andromeda, may be headed for a collision on a cosmic scale. What happens then?
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Supermassive black holes in a 'death spiral' could collide – what impact will it have?
Astronomers have identified what appears to be two supermassive black holes that could collide within a century, sending out huge gravitational waves that will be felt on Earth. The bizarre event, ...
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