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The answer is B. A black hole pulls in gas from a nearby companion star. Before crossing the event horizon, this matter heats up and emits X-rays.
The reason it happens before it crosses the event horizon is that once it goes past the event horizon it cannot escape
The answer is B. A black hole pulls in gas from a nearby companion star. Before crossing the event horizon, this matter heats up and emits X-rays.
The reason it happens before it crosses the event horizon is that once it goes past the event horizon it cannot escape