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Sun: Facts - NASA Science Our Sun: Facts Our 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 It’s about 93 million miles (150 million kilometers) from Earth and it’s our solar system’s only star Without the Sun’s energy, life as we know it could not exist on our home planet
Sun | Definition, Composition, Properties, Temperature . . . Sun, star around which Earth and the other components of the solar system revolve It is the dominant body of the system, constituting more than 99 percent of its entire mass The Sun is the source of an enormous amount of energy, a portion of which provides Earth with the light and heat necessary to support life
All About the Sun | NASA Space Place – NASA Science for Kids More fun facts about the Sun! The Sun goes through ups and downs in activity like solar flares It gets more active with more sunspots and then less active over a period of 11 years This is called the solar cycle The Sun has been getting slowly brighter since it was born A couple of billions of years ago, the Sun was a little dimmer than it is now The Sun contains almost ALL of the