What is Cosmic Expansion?

Cosmological Redshifts result from the expansion of space between us and a distant galaxy or quasar. Space is expanding everywhere, so the more distant an object is, the more rapidly it appears to be moving away. According to Hubble's Law. The dominant motion in the universe is the smooth expansion known as Hubble's Law. This is referred to as the "cosmic velocity dispersion" or "cosmic scatter" and is probably due to the fact that the gas clouds that formed the galaxies all had some small additional motion of their own.

Dr. Wendy Freedman determined space to expand at 72 kilometers per second per megaparsec - roughly 3.3 million light years - meaning that for every 3.3 million light years further away from the earth you are, the matter where you are, is moving away from earth 72 kilometers a second faster. In a closed universe, gravity eventually stops the expansion of the universe, after which it starts to contract until all matter in the universe collapses to a point, a final singularity called the Big Crunch, the opposite of the Big Bang.

Hubble's law is a fundamental relation between, the recessional velocity contributed by the expansion of space and the distance to an object; the connection between Redshift and distance is a crutch used to connect Hubble's law with observations.

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How Electric Current is formed?

How Electric Current is formed? Have you ever wondered how Electric Current is formed? Generally, the flow from one point to another through a medium is called a current. When an electric charge moves from one point to another inside a conductor or a semiconductor, it is actually conducting electric current. Electric charge carriers are micro particles that conduct the electricity. They can be protons, electrons, holes or ions depending on their availability in the conducting material. Normally electrons and holes are responsible for conducting electricity. This process occurs when a Voltage or a Potential Difference is applied at the two ends of a conductor or a semiconductor. Thus Electric Current is formed when a Voltage of Potential Difference is applied at the two ends of a conductor or semiconductor, i.e. when a closed circuit is formed.

Evolution of Aircrafts

Since that fateful day in December of 1903, airplane design has changed dramatically. The Wright Brothers built a biplane with two propellers that were chain-driven by a gasoline motor. Our dependence on air travel over the years has forced airplane design to catch up with the times. On December 17, 1903, Wilbur and Orville Wright made four brief flights at Kitty Hawk with their first powered aircraft. The Wright brothers had invented the first successful airplane. The Wrights used this stopwatch to time the Kitty Hawk flights. Aircrafts have evolved so much from the initial days. From 2 seater to the latest air bus type, they have come a long way. The history of aviation extends for more than two thousand years, from the earliest forms of aviation such as kites and attempts at tower jumping to supersonic and hyper-sonic flight by powered, heavier-than-air jets. Kite flying in China dates back to several hundred years BC and slowly spread around the world. Sir George Cayley...

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