Something I heard on "Dreamland" (a radio show) a couple weeks back that piqued my interest. I always wondered how quickly the effects of gravity traveled. Is it limited by the speed of light? And, if so, does that say anything about what gravity is?

Here's what I mean: If the sun magically disappeared right now -- POOF! -- it would take a few minutes (eight, I think) for us to see the light blink out, because that's how long it takes for light to travel from the sun to us. But would we feel an effect before then -- messed up tides, earthquakes, etc.?

Scientists have been pondering this, to... Spaceflight Now | Breaking News | Scientists attempt to measure speed of gravity

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