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Why can objects only travel at light speed in a vacuum. Theoretically shouldn't they just be able to accelerate to much higher than that? Photons especially have no weight so why are they limited to 300000 km/s.

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Why can objects only travel at light speed in a vacuum. Theoretically shouldn't they just be able to accelerate to much higher than that? Photons especially have no weight so why are they limited to 300000 km/s.	116