Any science freak out there can answer that?

[Minionman]

Photons travel at the speed of light and are believed to have no mass and an object approaching the speed of light is becoming exponentially heavier.  When the object passes the threshold and begins traveling at the speed of light does that incredible amount of mass spontaneously convert into energy? (Yikes!)
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Probably not. The mass just goes closer and closer to infinite, assuming you get enough energy to get it going that fast in the first place.

Objects traveling close to the speed of light become shorter and increase their mass. This plus the simple fact that objects moving at high speed are harder to see anyway may mean that as an object aproaches the speed of light (and it's power requirements increase exponentialy) it becomes nearly invisible anyway.

Also as objects become more massive they create greater distortions on space time which cause objects nearby to "curve" around it. When mass becomes great enough (such as a black hole) things that get too close get "sucked in" instead of curving around it. So light either curves away from the object or becomes trapped in the gravity well created by the object's mass. Again, the object would not be visible, other than the effect it has on nearby items.

That's how such objects would get detected. This would be extremely hard to test since the amount of energy needed to get somethign that heavy can't be easily made now by a long shot. The speed needed to get something black hole mass is lot of nines behind a decimal, more than 10 probably, since particles now from what I hear get up around 4 or so nines percent the speed of light and still are pretty light for everyday objects.