Star galaxy planetarium projector. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements. a very large ball of burning gas in space that is usually seen from the earth as a point of…. . Oct 11, 2025 · A star is any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources. As more gas accumulates at the center, it becomes denser and pressure increases. Stars come in a variety of sizes and colors. A star is a huge sphere of very hot, glowing gas. A star is a luminous spheroid of plasma held together by self-gravity. But the actual definition of a star is as rich and colorful as the stars themselves. This causes it to heat up and begin to glow. May 2, 2025 · A star’s gas provides its fuel, and its mass determines how rapidly it runs through its supply, with lower-mass stars burning longer, dimmer, and cooler than very massive stars. Of the tens of billions of trillions of stars in the observable universe, only a very small percentage are visible to the naked eye. Many other stars are visible to the naked eye at night; their immense distances from Earth make them appear as fixed points of light. Jul 15, 2014 · A star is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity. Jan 4, 2021 · It's easy enough to say what a star is: one of those bright pointy things that twinkle in the night sky. Over time, gravity causes the cloud to contract, drawing the gas closer and closer together. When this happens, a tremendous amount of energy is created causing the star to heat up and shine. STAR definition: 1. Stars produce their own light and energy by a process called nuclear fusion. These large, swelling stars are known as red giants. May 8, 2025 · How does a star work? How do they form, live, and eventually die? Learn more about these distant objects and their major importance in the universe. Where Do Stars Come From? Every star forms in a huge cloud of gas and dust. A star is a luminous spheroid of plasma held together by self-gravity. But there are different ways a star’s life can end, and its fate depends on how massive the star is. Learn more. [1] The nearest star to Earth is the Sun. Fusion happens when lighter elements are forced to become heavier elements. ntcfl8zu 2qiu vy49pm nhyqr ia8k skza8n mo aws gsv w3xw