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The benefits of a bedtime routine
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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 its pull twice as strong, and bringing two objects twice as close quadruples their mutual pull.
48
240 reads
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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
52
292 reads
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...
47
192 reads
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...
49
219 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...
53
216 reads
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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
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