What Holds a Galaxy Together?
Galaxies are vast collections of stars, gas, and dust that are bound together by gravity. They come in all shapes and sizes, from small dwarf galaxies to giant elliptical galaxies. But what exactly is it that holds these galaxies together?
Gravity
Gravity is the primary force that holds galaxies together. It is a force that attracts any two objects with mass. The more mass an object has, the stronger its gravitational pull.
In a galaxy, the stars are the most massive objects. They exert a strong gravitational pull on each other, which keeps them from flying apart. The gas and dust in the galaxy also exert a gravitational pull on each other and on the stars. This helps to keep the galaxy stable.
Dark Matter
Dark matter is a type of matter that does not emit or reflect any light. It is thought to make up about 85% of the matter in the universe. Dark matter is thought to be distributed throughout galaxies, and it plays a role in holding them together.
The gravitational pull of dark matter helps to keep the stars and gas in a galaxy from flying apart. It also helps to shape the galaxy’s structure.
The Hubble Constant
The Hubble constant is a number that describes the expansion of the universe. It is thought that the universe is expanding at an accelerating rate. This acceleration is caused by a force called dark energy.
Dark energy is thought to be pushing galaxies apart. However, the gravitational pull of the stars and dark matter in galaxies is strong enough to overcome the effects of dark energy. This is what keeps galaxies from flying apart.
Conclusion
The forces of gravity, dark matter, and the Hubble constant work together to hold galaxies together. These forces are essential for the stability and structure of galaxies.
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