Part 2 of 6 part Series of Understanding the Universe..
Equation 2:- "F = (M1.M2. G)/R^2"
Earlier in the history a Greek philosopher "Aristotle" gave the idea that motion is divided into earthly lines & heavenly Circles & so the planets must moves in the perfectly circles. Astronomers soon learned this wasn’t true, but the ideas of Aristotle
was so deeply rooted in the minds of scholars that astronomers imposed circular motion upon the heavens for a thousand years.
Then in the early seventeenth century Johannes Kepler published simple rules that described the motion of the planets. They are now known as Kepler’s laws of planetary motion. Kepler did not use circles to move the planets. Kepler suggested that planets moves in elliptical orbit. Kepler’s theory was the first step toward modern astrophysics, giving us an accurate description of planetary motion. But Kepler’s laws were still merely a description of motion.
It was Sir Isaac Newton who gave us the mechanism. In the late seventeenth century Newton published his Principia, which described a world which is governed by a simple set of rules for forces and motion ( three laws of Motion which governed motion of body & a law of Gravitation)
Here F represents the force between two bodies, the M’s are the masses of the two bodies, R is the distance between them, and G is a number known as the gravitational constant.
What the equation says is that bodies are attracted towards each other through gravitational attraction. The strength of their attraction is greater if they are close together, and lesser if they are more distant. This force of attraction exists between any two bodies. Between Sun and planet, between Earth and moon, and between me and you.
Newton's laws are so accurate that he could use his rules to explain why the planets moved in ellipses.
There is, however, a mysterious consequence of Newton’s equation. The force of gravity is always attractive, and the closer two bodies are the stronger their attraction.
It would seem then that if large enough masses got close enough together the gravitational attraction would be so strong that the objects would be crushed under their own weight. Gravity would pull ever stronger, squeezing the objects more and more, making them smaller and smaller until they finally collapsed into a single, infinitely dense point. A gravitational singularity. which is also called A Black hole where gravitational attraction is so strong that nothing can escape its pull, not even light therefore it is Black hole.
In 1974, radio astronomers discovered an intense energy source at the center of our galaxy. Named Sagittarius A*, it appeared to be a large black hole.
Newton’s equation gave us the mechanism behind the motion of the planets. It tells how we are connected to everything in the universe through mutual attraction.
Equation 2:- "F = (M1.M2. G)/R^2"
Earlier in the history a Greek philosopher "Aristotle" gave the idea that motion is divided into earthly lines & heavenly Circles & so the planets must moves in the perfectly circles. Astronomers soon learned this wasn’t true, but the ideas of Aristotle
was so deeply rooted in the minds of scholars that astronomers imposed circular motion upon the heavens for a thousand years.
Then in the early seventeenth century Johannes Kepler published simple rules that described the motion of the planets. They are now known as Kepler’s laws of planetary motion. Kepler did not use circles to move the planets. Kepler suggested that planets moves in elliptical orbit. Kepler’s theory was the first step toward modern astrophysics, giving us an accurate description of planetary motion. But Kepler’s laws were still merely a description of motion.
It was Sir Isaac Newton who gave us the mechanism. In the late seventeenth century Newton published his Principia, which described a world which is governed by a simple set of rules for forces and motion ( three laws of Motion which governed motion of body & a law of Gravitation)
Here F represents the force between two bodies, the M’s are the masses of the two bodies, R is the distance between them, and G is a number known as the gravitational constant.
What the equation says is that bodies are attracted towards each other through gravitational attraction. The strength of their attraction is greater if they are close together, and lesser if they are more distant. This force of attraction exists between any two bodies. Between Sun and planet, between Earth and moon, and between me and you.
Newton's laws are so accurate that he could use his rules to explain why the planets moved in ellipses.
There is, however, a mysterious consequence of Newton’s equation. The force of gravity is always attractive, and the closer two bodies are the stronger their attraction.
It would seem then that if large enough masses got close enough together the gravitational attraction would be so strong that the objects would be crushed under their own weight. Gravity would pull ever stronger, squeezing the objects more and more, making them smaller and smaller until they finally collapsed into a single, infinitely dense point. A gravitational singularity. which is also called A Black hole where gravitational attraction is so strong that nothing can escape its pull, not even light therefore it is Black hole.
In 1974, radio astronomers discovered an intense energy source at the center of our galaxy. Named Sagittarius A*, it appeared to be a large black hole.
Newton’s equation gave us the mechanism behind the motion of the planets. It tells how we are connected to everything in the universe through mutual attraction.
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