A star is a luminous spheroid of plasma held together by self-gravity. [1] The nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night; their immense distances …

Oct 27, 2025 · A star is any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources. Of the tens of billions of trillions of stars in the …

May 2, 2025 · Stars are giant balls of hot gas – mostly hydrogen, with some helium and small amounts of other elements. Every star has its own life cycle, ranging from a few million to …

May 8, 2025 · Stars are huge balls of hot, glowing gas that make light and heat through fusion. As stars die, they spread elements in space that help make new stars, planets, and life. The stars …

May 3, 2025 · What Is a Star? A star is a luminous sphere of plasma held together by gravity. It generates energy through nuclear fusion in its core — a process in which lighter atomic nuclei …

Below are lists of the largest stars currently known, ordered by radius and separated into categories by galaxy. The unit of measurement used is the radius of the Sun (approximately …

Oct 27, 2025 · Throughout the Milky Way Galaxy (and even near the Sun itself), astronomers have discovered stars that are well evolved or even approaching extinction, or both, as well as …

The amount of material in a star (its mass) is so huge that a nuclear reaction called nuclear fusion goes on inside it. This reaction changes hydrogen to helium and gives off heat.

STAR frequently asked questions (FAQs) Find answers to your questions about the STAR program, as well as STAR Credit Direct Deposit and the Homeowner Benefit Portal.

Jun 3, 2025 · Within each system, the star sits at the centre, providing heat and light that shapes and characterises the planets and other bodies in orbit around it. That light may even be the …