26AUG 2016
Gravitational force of all planets

Gravitational force of all planets

The Sun, Earth, moon and all other objects in the solar system attract each other with a force called gravity. This gravitational force only attracts and never repels and can act over an infinite distance. Newton explained this force in his law of universal gravitation. He stated that everybody in the…
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23AUG 2016
Einstein theory of time

Einstein theory of time

One of the most surprising features of special relativity is that a number of statements and results which we usually think to be absolute turn out to be observer-dependent. In particular, statements about space and time, distances and duration turn out to be relative. For example, in Einstein s theory…
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20AUG 2016
Law of gravity Newton

Law of gravity Newton

Newton s Three Laws of Motion and his Law of Gravity are probably the most famous of all physics. They govern the motion of objects that we see in our everyday lives. Newton s First Law of Motion says that an object will remain in its state of motion unless acted upon by force. Essentially, this means…
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17AUG 2016
Dark matter in the universe

Dark matter in the universe

This Hubble Space Telescope image shows NGC 1275, the galaxy located in the center of the Perseus Galaxy Cluster. The red threadlike filaments are composed of cool gas suspended by a magnetic field. Credit: NASA/ESA/Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration These mysterious substances are…
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14AUG 2016
What is dark matter?

What is dark matter?

Years ago I read an article by Martin Rees, in which he surveyed the options for what the dark matter of the universe might be. I forget the exact wording, but near the end he said something like “There are so many candidates, it would be quite surprising to find ourselves living in a universe without…
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11AUG 2016
There is no gravity

There is no gravity

Each galaxy is held together by strong gravitational forces. Even if you managed to get away from our sun, you would still experience the galaxy s gravity. This image is an artisitic rendition of our galaxy. Public Domain Image, source: Christopher S. Baird. There is gravity in space – lots of it. Gravity…
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08AUG 2016
Gravitational pull between two objects

Gravitational pull between two objects

Newton s Theory of Gravity states that every object in the universe pulls on every other object. Every object feels this force, so it is a universal force. The force is always attractive; it is always a pull, never a push. Picture the force of gravity as the tension in an imaginary rope between two objects…
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05AUG 2016
Pull of gravity on an object

Pull of gravity on an object

The downward pull of the weight of an object is the force that causes the downward acceleration of that object. Objects fall because of their weight. Without air resistance an object on Earth will accelerate at a rate of 9.8 m/s 2 as it falls. Normally, falling bodies experience air resistance. With…
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02AUG 2016
Isaac Newton developed the law of Gravitation

Isaac Newton developed the law of Gravitation

Isaac Newton is considered one of the most important scientists in history. Even Albert Einstein said that Isaac Newton was the smartest person that ever lived. During his lifetime Newton developed the theory of gravity, the laws of motion (which became the basis for physics), a new type of mathematics…
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30JUL 2016
Who invented gravity?

Who invented gravity?

Sir Isaac Newton Isaac Newton was born in 1642 in a manor house in Lincolnshire, England. His father had died two months before his birth. When Isaac Newton was three his mother remarried, and Isaac remained with his grandmother. He was not interested in the family farm, so he was sent to Cambridge University…
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