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Q&A: Black Holes

Q:
If it is true that the magnetic field of a black hole is so strong that even light can't escape it ,what will happen when one black hole comes under the influence of the magnetic field of another black hole?

A:
It is the gravitational field, not the magnetic field, of a black hole that is so strong that it captures light. If two black holes collide, calculations indicate that they will merge to form a larger, more massive black hole. Large amounts of gravitational waves may be produced in such a merger, which is why scientists are excited by the prospect of gravitational wave observatories. See http://lisa.nasa.gov.

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