How does the orbit of photons within the universe contribute to our understanding of the cosmos?

Well, honey, photons don't really have orbits because they don't have mass. But their movement sure does help us with a lot of things in astronomy. By studying the paths photons take, scientists can learn about the composition, temperature, and even the expansion of the universe. It's like following a trail of breadcrumbs through the cosmic oven—the information is delicious!