Black holes: Cosmic signal rattles Earth after 7 billion years
Gravitational waves arrive from a black hole collision that occurred half-way across the Universe.
from BBC News - World https://ift.tt/2EXefUq
https://ift.tt/2EXefUq
from BBC News - World https://ift.tt/2EXefUq
https://ift.tt/2EXefUq
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