Yoder

The Sun has only 22 galactic orbits left. Earth races around the Sun at ~67,000 mph (107,000 km/h), giving us our familiar 365.25-day year and changing seasons. But the Sun is in motion too, hurtling through the Milky Way at ~514,000 mph (828,000 km/h) on a grand orbit around the galactic center. One complete lap, known as a cosmic year, takes roughly 225–230 million years. When the Sun finished its most recent galactic orbit, the earliest dinosaurs were just beginning to roam Earth. Since its birth ~4.6 billion years ago, our star has completed about 20 such orbits. Stellar models predict the Sun will keep fusing hydrogen in its core for another ~5 billion years before it swells into a red giant and eventually fades into a white dwarf. At its current orbital speed, that leaves roughly 22 more laps around the Milky Way. Each cosmic year sweeps the entire Solar System tens of thousands of light-years across the galaxy, through dense spiral arms rich with star-forming regions, past ancient globular clusters, and amid countless other stars. Continents drift, mountains rise and erode, entire species evolve and vanish, all within a tiny fraction of one galactic circuit. Human civilization, from the first cities to today’s digital age, has existed for less than 0.001% of a single cosmic year. We are passengers on a star halfway through its ~10-billion-year galactic journey across a 100,000-light-year-wide disk, witnessing just the briefest sliver of one ongoing lap in an unimaginably vast cosmic dance.