Read this excerpt from A Black Hole Is NOT a Hole.
What is this passage describing?

In Moving Light2, light is on the go again, this time in a slow-
motion trek through the universe. You track its path as it
moves outward from a star (instead of a flashlight). Some of
it bounces off asteroids, gases, and dust in its way, just as it
reflected off the droplets of fog on Earth

light in space

a star

a flashlight

fog on Earth