Its gravity holds the solar system together, keeping everything from the biggest planets to the smallest bits of debris in orbit around it.Įven though the Sun is the center of our solar system and essential to our survival, it’s only an average star in terms of its size. Its diameter is about 865,000 miles (1.4 million kilometers). The Sun is the largest object in our solar system. The science of studying the Sun and its influence throughout the solar system is called heliophysics. But the Sun is a dynamic star, constantly changing and sending energy out into space. Without the Sun’s energy, life as we know it could not exist on our home planet.įrom our vantage point on Earth, the Sun may appear like an unchanging source of light and heat in the sky. It’s about 93 million miles (150 million kilometers) from Earth and it’s our solar system’s only star. The Sun is a 4.5 billion-year-old yellow dwarf star – a hot glowing ball of hydrogen and helium – at the center of our solar system.
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