When I was playing around with the equations for Gravitational Time Dilation, I discovered that when a negative value was plugged in for $M$, the equation gave the exact same answer, and it would never give an imaginary answer if $r$ was positive. Why exactly does this happen?
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Related question by OP: http://physics.stackexchange.com/q/254858/2451 – Qmechanic May 09 '16 at 14:22
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Why exactly does this happen? GIGO. When you put garbage in, you should not be surprised that you get garbage out. – David Hammen May 09 '16 at 14:32