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Gravity is one of the universe's fundamental forces

Gravity is one of the universe's fundamental forces

Scientists know four forces - things that attract or repel one object from another. The strong force and the weak force operate only inside the centres of atoms. The electromagnetic force rules objects with excess charge, and gravity directs objects with mass.

People have long speculated about gravity. While ancient Greek and Indian philosophers observed gravity, it was the insight from Isaac Newton that made it possible to measure and predict the phenomenon.

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Increased understanding of the gravitational pull

While Isaac Newton's description of gravity was good enough to detect Neptune's existence in the mid-1800s, Newton's law was not perfect. Astronomers discovered a mismatch between his law and the laws of nature.

This mismatch was resolved in 1915 when Albert Einstein published his theory o...

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The universal law of gravitation

In 1687, Isaac Newton's treatise Philosophiæ Naturalis Principia Mathematica showed that every object in the universe, small and great, pulled on every other object, from a grain of sand to the planets.

Newton could compute the attraction: Doubling the mass of one object makes it...

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222 reads

Einstein and the shape of spacetime

Albert Einstein held that space and time together made up the universe's fabric that could stretch and compress. Einstein suggested that the shape of spacetime is what gives rise to the force of gravity. A concentration of mass, like the earth or sun, ben...

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Gravity as a tool of discovery

The current description of gravity is so accurate that it has become a guide for cosmic discoveries.

American astronomers noticed in the 1960s that galaxies appear to rotate fast enough to spin-off stars. However, they did not whirl apart, and something seems to help them stick together. M...

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What Is Gravity?

What Is Gravity?

space.com

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hoc_ferd

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Gravity And The Forces Of Nature

Gravity And The Forces Of Nature

According to physicists, quantum particles are responsible for three forces of nature:

  • Strong nuclear force.
  • Weak nuclear force.
  • Electromagnetic force.

The fourth force of nature, gravity, is till now assumed to not originate from quantum par...

Gravity is fundamental to the workings of the Universe

Without the force of gravity, the intense pressures at the core of the sun would cause it to burst open. The same fate would befall other stars in the Universe. Eventually, there would only be a diffuse soup of atoms and molecules drifting around.

While this scenar...

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