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     science-resources.co.uk

     • Throughout their lives, stars fight the inward pull of the force of gravity. It is only the outward pressure created by the nuclear reactions pushing away from the star's core that keeps the star "intact". But these nuclear reactions require fuel, in particular hydrogen. Eventually the supply of hydrogen runs out and the star begins its demise.
     imagine.gsfc.nasa.gov/educators/lifecycles/LC_main_p1.html

     Life Cycles of Stars (Grades 9-12) - Page 1

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   What happens if a supernova ejects a star into space?

   • About 75% of the mass of the star is ejected into space in the supernova. The fate of the left-over core depends on its mass. If the left-over core is about 1.4 to 5 times the mass of our Sun, it will collapse into a neutron star. If the core is larger, it will collapse into a black hole.

   Stars - Imagine the Universe!

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   What happens when a star explodes?

   • The star’s iron core collapses until forces between the nuclei push the brakes, and then it rebounds back to its original size. This change creates a shock wave that travels through the star’s outer layers. The result is a huge explosion called a supernova.

   The Lives, Times, and Deaths of Stars - NASA Science

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   What happens when a star collapses?

   • When that happens, the star can no longer hold up against gravity. Its inner layers start to collapse, which squishes the core, increasing the pressure and temperature in the core of the star. While the core collapses, the outer layers of material in the star to expand outward.

   Stars - Imagine the Universe!

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   What happens when a star is forming?

   • At the same time a star is forming, so are the planets that will orbit it. Both star formation and planet formation happen within disks via accretion. As gas and dust swirls around the star, delineations begin to appear in the disk. Astronomers saw this for the first time in 2014 in a young star called HL Tauri.

   The physics of accretion: How the universe pulled itself together

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   How does fusion affect a star?

   • The energy produced by fusion creates pressure inside the star that balances gravity’s tendency to pull matter together, so the core starts to collapse. But squeezing the core also increases its temperature and pressure, making the star slowly puff up. However, the details of the late stages of the star’s death depend strongly on its mass.

   Stars - NASA Science

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   What happens during a star's life?

   • During most a star's lifetime, the interior heat and radiation is provided by nuclear reactions in the star's core. This phase of the star's life is called the main sequence. Before a star reaches the main sequence, the star is contracting and its core is not yet hot or dense enough to begin nuclear reactions.

   Stars - Imagine the Universe!

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3. imagine.gsfc.nasa.gov › science › objectsStars - Imagine the Universe!

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   Sep 23, 2021 · About 75% of the mass of the star is ejected into space in the supernova. The fate of the left-over core depends on its mass. If the left-over core is about 1.4 to 5 times the mass of our Sun, it will collapse into a neutron star.

4. science.nasa.gov › universe › starsStars - NASA Science

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   At the beginning of the end of a star’s life, its core runs out of hydrogen to convert into helium. The energy produced by fusion creates pressure inside the star that balances gravity’s tendency to pull matter together, so the core starts to collapse.

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6. www.astronomy.com › science › the-physics-ofThe physics of accretion: How the universe pulled itself together

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   Jun 16, 2022 · Both star formation and planet formation happen within disks via accretion. As gas and dust swirls around the star, delineations begin to appear in the disk.

7. science.nasa.gov › universe › the-lives-times-andThe Lives, Times, and Deaths of Stars - NASA Science

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   Sep 16, 2020 · The star’s iron core collapses until forces between the nuclei push the brakes, and then it rebounds back to its original size. This change creates a shock wave that travels through the star’s outer layers. The result is a huge explosion called a supernova.

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9. imagine.gsfc.nasa.gov › educators › lifecyclesLife Cycles of Stars (Grades 9-12) - Page 1

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   May 7, 2015 · Throughout their lives, stars fight the inward pull of the force of gravity. It is only the outward pressure created by the nuclear reactions pushing away from the star's core that keeps the star "intact".

10. science.nasa.gov › learn › basics-of-space-flightChapter 3: Gravity & Mechanics - NASA Science

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    The Moon's gravitation acts upon the Earth's oceans and atmosphere, causing two bulges to form. The bulge on the side of Earth that faces the moon is caused by the proximity of the moon and its relatively stronger gravitational pull on that side. Illustration of spacecraft stabilized by gravity gradient.

11. phys.libretexts.org › Bookshelves › Astronomy20: Between the Stars - Gas and Dust in Space - Physics ...

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    Apr 10, 2022 · At the same time, gas is constantly being added to the Galaxy by accretion from extragalactic space, while mass is removed from the interstellar medium by being locked in stars. Some of the mass in stars is, in turn, returned to the interstellar medium when those stars evolve and die.