The Night Sky Is a Collage of the Past — We've Never Seen the Universe's 'Now'
Sunlight left the Sun about eight minutes ago. Light from Proxima Centauri, our nearest star, is about 4.2 years old. The Andromeda Galaxy's light is roughly 2.5 million years old. Because light speed is finite, looking farther always means looking further back in time. SORABUMI translates this into everyday scale to explain why a single glance at the night sky holds hundreds of millions of years at once.