Transformers: Dark of the Moon (2011)/變形金剛3: 32:58
The reason beams are visible is because airborne particles reflecting the light in the team to light sensors. Particles are AIRborne either because of, duh, suspended in the AIR, or the absence of gravity. Although the gravitational force on moon is only 1/6th of Terra, it still exists. ie. Unless disturbed, there is no AIRborne particle on moon. Hence there cannot be visible beams. As there is no air to stop the dust, disturbed dust would be moving in the direction of projectiles, instead of suspending in mid AIR.
看得見光芒是因為懸浮微粒將光芒中的光反射至感官（眼睛）。懸浮微粒之所以能懸浮，要不就是無引力，再不就是有空氣。月球沒有空氣。雖然引力只有地球的1/6，但還是有引力。因此除非有外力揚起灰塵，否則是看不見光芒的。而在月球被揚起的灰塵，因為沒有空氣阻力，所以會以拋物線軌跡揚起、落下。
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