The Sun's mass is around 330,000 times that of Earth's, making up about 99.86% of the total mass of the Solar System. The mass of the Sun's surface layer, its photosphere, consists mostly of hydrogen …

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 million °C) and …

Mar 28, 2026 · 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.

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, seasons, and …

Oct 18, 2023 · The Sun is a dynamic and complex star that plays a critical role in our daily lives. It’s a massive, incredibly hot ball of gas that’s been burning bright for billions of years.

The Sun is nearly a perfect sphere and has a diameter of about 1.39 million kilometers (or 864,000 miles), which is about 109 times wider than Earth. Its mass is 333,000 times heavier than Earth, and …

Mar 26, 2026 · 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.

It is the main source of energy for life on Earth. The Sun has been an object of veneration in many cultures and a central subject of astronomical research since antiquity.

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 chains.

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.