Sun - Wikipedia The Sun is the star at the centre of the Solar System It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies
Our Sun: Facts - Science@NASA 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 Life on Earth depends on the Sun Here are just a few reasons why: The Sun’s gravity holds our entire solar system together Our solar system is even named after the Sun (the Latin word for Sun is “sol”) Heat from the Sun makes Earth warm enough to live on
Meet the Sun - Center for Science Education Like other stars, the Sun is a dense ball of gas that creates energy through nuclear fusion reactions in the core, creating helium atoms from hydrogen atoms The Sun radiates different forms of energy, including ultraviolet, infrared, and light energy, out into space Light and heat energy from the Sun warm our planet and make life possible
The Sun By the Numbers – NASA Solar System Exploration The Sun is the star at the heart of our solar system Its gravity holds the solar system together, keeping everything – from the biggest planets to the smallest bits of debris – in its orbit
Sun Fact Sheet - NSSDCA Solar Atmosphere Surface Gas Pressure (top of photosphere): 0 868 mb Pressure at bottom of photosphere (optical depth = 1): 125 mb Effective temperature: 5772 K Temperature at top of photosphere: 4400 K Temperature at bottom of photosphere: 6600 K Temperature at top of chromosphere: ~30,000 K Photosphere thickness: ~500 km Chromosphere thickness: ~2500 km Sun Spot Cycle: 11 4 yr Photosphere
The Sun - Science@NASA The Sun is the star at the heart of our solar system Its gravity holds the solar system together, keeping everything — from the biggest planets to the smallest bits of debris — in its orbit The Sun's gravity holds the solar system together, keeping everything – from the biggest planets to the smallest particles of debris – in its orbit
Sun Releases Strong Flare - NASA Science The Sun emitted a strong flare, peaking at 5:49 p m ET on Tuesday, June 17, 2025 NASA’s Solar Dynamics Observatory, which watches the Sun constantly,