You don’t look a day over 4.5 billion-years. ☀️⁣ ⁣ #HappyNewYear from the star of the show that makes all this possible, as we begin a new orbit around our Sun, 93 million miles (150 million km) from Earth. Cosmically middle-aged and classified as a yellow dwarf, the Sun's dynamic and ever-changing nature constantly sends energy into the solar system. Scientists can estimate the age of the Sun by looking at the most ancient things in our solar system, which along with the Sun, all formed around the same time. ⁣ The Sun is at the center of our solar system, 865,000 miles wide (1.4 million km) with a core that reaches temperatures of 27 million degrees Fahrenheit (15 million degrees Celsius). Our Sun’s gravity holds our solar system together, from the largest planets to the smallest space debris. ⁣ ⁣ A fleet of spacecraft monitors the Sun 24/7, broadening our knowledge of the star in a branch of science known as heliophysics – including the spacecraft that took this image: the Solar Dyna...