Arvin Ash

What Is Dark Matter? (2018x20)

Udgivelsesdato: Aug 25, 2018

What is Dark Matter? -- What if I told you that there may be trillions of particles going through your body right now, and you can’t see it, hear it, or touch it. And that these particles are so vast, that they compose more than 6 times all the visible matter you can see in the universe. 6 times all the stars, galaxies, planets, gases, and radiation. And we not only cannot see any of it with our eyes, we cannot detect it with any of our instruments. So how the heck do we know that it’s even there? In the late 1970’s, an astronomer by the name of Vera Rubin, who happened to be a female in a male-dominated profession, was studying a mundane area of astronomy that no one else seemed to be interested in at the time. She was looking at the motion of stars in the spiral portions of the Andromeda galaxy, a neighbor of our own milky way galaxy. What she found shocked scientists…because it seemed to violate Newton’s laws of gravitation which had been established as scientific law for the previous 300 years. Her observations showed that the stars in the outer rim of the spiral arms were moving at about the same velocity as the stars in the inner part of the spiral arm. This violates Newton’s law of universal gravitation which should govern both the motion of stars in galaxies as well as the motion of planets around the sun. Force of Gravity = G m1 m2 / r2 m1= mass of first planet m2 = mass of second planet r2= square of distance between them G = Gravitational constant The equations dictate that the further away an object is from the center of mass (r), the lower the force of gravity, and the slower the object rotates around it. Stars closer to the center must travel faster than those away from the center. Otherwise, the stars would fly away from their orbits around the galaxy. This is easy to see in the motion of all the planets in our own solar system – which follow Newton’s laws pretty much to the letter. Vera Ru