Light's Unending Journey Across the Universe | JQJO

An astrophysicist shares a captivating story of observing the Pinwheel galaxy, sparking a discussion about light's seemingly tireless journey across vast cosmic distances. Light, being massless, travels at a constant speed, and while some energy is lost through scattering, unimpeded light maintains its speed. The article explains that time dilation affects how light's travel time is perceived; from the photon's perspective, the journey is instantaneous, while from Earth's, it takes millions of years. This perspective shift highlights the relativity of time and space.