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It depends on how you mean it. If one is holding a laser and light is shining on it, then of course it can be seen. But I assume you are talking about a laser beam.

For the spot where the beam hits some object, yes the illuminated spot is visible. A vacuum has no real effect on light. A vacuum environment is just an environment that has had all the air (and other material) sucked out of it (and thus all objects regardless of shape and size fall at the same speed, but one digresses) but this vacuum has little effect on light.

On the other hand, if you're talking about seeing the beam itself then the answer is no. Light travels in a straight line unless it's path is effected by some matter. If a laser projects its light in any direction except directly at your eye, none of the light will enter your eye unless something causes its path to change. In air, there is usually some dust, smoke, mist, or some such stuff that scatters a small fraction of the laser light and allows you to see the beam. Even in perfectly clean air, the air itself scatters a very small fraction of the light, so a bright enough beam can be seen. But in a vacuum, there is no material to divert any of the light toward your eye, so you can not see it at all.

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12y ago

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