Suppose that a large piece (e.g.,5 solar masses)of purple,magnetized iron is rotating five times per day.If this object were able to collapse gravitationally to form a black hole,which property of the matter inside the black hole could an outside observer actually measure?

Question

Quizplus · Accepted Answer

An outside observer can measure the rotation of a black hole, known as its angular momentum. This is one of the three observable properties of a black hole, along with mass and electric charge. The magnetic field, color, and composition are not directly observable once the matter has collapsed into a black hole.

Suppose That a Large Piece (E