The beam of a light spreads out after leaving the flashlight. the beam grows wider and wider. this is best explained by

When you leave the flashlight power on, the beam of its light will grow wider and wider because the individual photon travels though space forever as long as it don’t hit anything. While the beam grows wider, the photons also spread thinner.

The moths will eventually become extinct

When scientist examine data such as historical documents, they are using the "scientific methods"