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 …

Historically, stars have been important to civilizations throughout the world. They have been part of religious practices, divination rituals, mythology, used for celestial navigation and …

Oct 27, 2025 · This article describes the properties and evolution of individual stars. Included in the discussion are the sizes, energetics, temperatures, masses, and chemical compositions of …

Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores.

Nov 20, 2025 · Stars are spherical balls of hot, ionized gas (plasma) held together by their own gravity. Stars are the most fundamental building blocks of our universe.

False-color imagery of the Sun, a G-type main-sequence star, the closest to Earth. Image courtesy of NASA. What are Stars? A star is a massive, luminous sphere of plasma held …

Sep 21, 2024 · Stars are massive, luminous spheres of gas, mainly composed of hydrogen, with smaller amounts of helium and other elements. The lifespan of a star varies widely, generally …

Mar 31, 2025 · This landscape of “mountains” and “valleys” speckled with glittering stars is actually the edge of a nearby, young, star-forming region... Astronomers using NASA’s Hubble …

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 22, 2024 · The universe’s stars range in brightness, size, color, and behavior. Some types change into others very quickly, while others stay relatively unchanged over trillions of years.