Black Hole Collision

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Biggest ever merge of two massive black holes detected.

LIGO = Laser Interferometer Gravitational-wave Observatory = a large-scale physics experiment and observatory designed to directly detect gravitational waves and use them to study the universe

ripple = PHYSICS a small wave or a fluctuating component within a larger system which signifies a deviation from a steady state, often unwanted

spacetime = a mathematical model that joins space and time into a single idea called a continuum

leap into action = to start acting immediately and with purpose

EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.