Sun: Facts - NASA Science

Sun - NASA Science

Solar power, even at night: These giant space mirrors could send sunlight back to Earth after dark

Every ray of sunlight that reaches Earth begins deep inside the Sun. At the core of our star, hydrogen atoms collide and fuse into helium. This nuclear fusion releases enormous amounts of energy. That energy starts its journey as photons, created under extreme pressure and temperature nearly 15 million degrees Celsius. But those photons don’t immediately escape. Inside the Sun, matter is so dense that light is constantly absorbed and re-emitted by surrounding particles. Instead of moving straigh

4k video of the Sun's surface activity