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- A star's gravity pulls in on itself. This should cause a star to collapse. Unlike the Earth, stars are not solid. So what prevents them from collapsing? In main-sequence stars, it is the pressure from the nuclear fusion reactions deep in the star's core. This balance between outward pressure and inward pull is called hydrostatic equilibrium.
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Aug 10, 2023 · The stars may seem fixed, but they’re not. Here are a few of the ways we can watch the heavens change.
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.
- Stellar Evolution
- The Fate of Medium-Sized Stars
- The Fate of Massive Stars
A star is born, lives, and dies, much like everything else in nature. Using observations of stars in all phases of their lives, astronomers have constructed a lifecycle that all stars appear to go through. The fate and life of a star depends primarily on it's mass. All stars begin their lives from the collapse of material in a giant molecular cloud...
When a medium-sized star (up to about 7 times the mass of the Sun) reaches the red giant phase of its life, the core will have enough heat and pressure to cause helium to fuse into carbon, giving the core a brief reprieve from its collapse. Once the helium in the core is gone, the star will shed most of its mass, forming a cloud of material called ...
A red giant star with more than 7 times the mass of the Sun is fated for a more spectacular ending. These high-mass stars go through some of the same steps as the medium-mass stars. First, the outer layers swell out into a giant star, but even bigger, forming a red supergiant. Next, the core starts to shrink, becoming very hot and dense. Then, fusi...
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May 17, 2023 · The primary cause of star movement in our night sky is Earth's rotation. Our planet rotates on its axis once every 24 hours, causing celestial bodies to appear as if they are moving across our night sky. As Earth rotates from west to east, objects in the sky appear to move from east to west.
Jan 15, 2023 · Over millions of years gravity slowly pulls clumps of dust and gas, mostly hydrogen and helium, together to form a gas cloud. As these clouds get bigger their gravitational pull gets stronger, pulling in even more dust and gas. Eventually, the cloud gets so large that it's gravity causes it to collapse in on itself, forming a protostar.
Sep 26, 2022 · Due to its own gravitational pull, the cloud begins to collapse inward, and as it shrinks, it spins more and more quickly, with the outer parts becoming a disk while the innermost parts become a...
