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 …

Apr 22, 2025 · The core is the hottest part of the Sun. Nuclear reactions here – where hydrogen is fused to form helium – power the Sun’s heat and light. Temperatures top 27 million °F (15 …

The Sun is the engine behind much of Earth’s environment, providing energy for everything from ocean currents and weather patterns to the plants and algae that form the base of many food …

Feb 2, 2024 · The sun is an ordinary star, one of about 100 billion in our galaxy, the Milky Way. The sun has extremely important influences on our planet: It drives weather, ocean currents, …

The Sun is the closest star to Earth and is the center of our solar system. Learn about fun Sun facts.

4 days ago · Sun - Evolution, Structure, Radiation: The Sun has been shining for 4.6 billion years. Considerable hydrogen has been converted to helium in the core, where the burning is most …

Nov 12, 2025 · The sun produced its strongest solar flare of 2025, an X5.1-class eruption from sunspot AR4274 triggering severe radio disruptions across continents. The major event …

6 days ago · A powerful X1.9 solar flare from new sunspot AR4299 triggered strong radio blackouts, as giant sunspot AR4294 rotates into view with more activity likely.

Nov 25, 2025 · 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 …

Sun, Star around which the components of the solar system revolve. It is about 4.6 billion years old and is the dominant body of the system, with more than 99% of its mass.