😯👉🌟 Alpha Centauri — Our Closest Star Neighbor The nearest star system to Earth is Alpha Centauri, about 4.37 light-years away in the constellation Centaurus. Although it’s the closest system to us, its light still needs more than four years to arrive — a powerful reminder of how enormous space truly is. Alpha Centauri isn’t a single star. It’s actually a system of three stars: • Alpha Centauri A — Very similar to our Sun in size, brightness, and temperature. • Alpha Centauri B — Slightly sma