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 What Then Is Energy
 

The famous Albert Einstein gave us a theory that defines energy. We have all heard of the formula E=MC . Einstein said that all matter, whether visible or not, has energy. This discovery led to the invention of nuclear power and explained nuclear energy. We are all objects in a state of constant motion. The earth travels around the sun, and at the same time rotates on its own axis.

The movement around the sun creates gravitational force or energy. The rotation on its own axis creates a magnetic force or energy. The gravitational forces between the earth, the moon and the sun can be observed in the tides we experience every day and every month. The gravitational force or pull by the moon is weakest during every new moon, so the tide is low. During the full moon, the gravitational force, or the pull from the moon is strongest. The tide or water being pulled towards the moon side of the earth causes high tide. We therefore experience low tide and high tide. In fact, the seawater flows and follows the movement of the moon.

Another example of energy in action is in the falling-apple principle by Sir Isaac Newton, who used it to explain his Law of Gravity. Magnetic energy for example, can be observed in the workings of a compass. Some birds have navigational skills. These birds migrate thousands of miles from north to south during winter and fly back during spring because they are able to sense the earth's magnetic fields and use it to their advantage. It would appear that in many cases, animals are better equipped to read the earth's natural forces and apply this knowledge to their advantage.

The entire universe consists of many planets, stars and groups of constellations. The energy and forces of these celestial objects can and have been measured. This energy travels in wave-like pattern throughout the universe and influences life on earth. Take sunlight, for example. As we know, sunlight is a form of energy. Plants, through photosynthesis, absorb the sunlight and convert the energy into food for their own use. Plants are then consumed by animals and humans to produce energy.

When a beam of light passes through a narrow slit and then through a prism, it spreads out into a rainbow of colours called spectrum. The spectrum runs from high frequencies of visible light to low ones - violet, indigo, blue, green, yellow, orange and red. Since we see these colours, it is called the spectrum of visible light. Apart from the visible segment of the spectrum, there is also a part of the spectrum at higher frequencies.

Beyond the violet is a part of the spectrum called the ultraviolet; a perfectly real kind of light, carrying death to the microbes. It is invisible to us, but readily detectable by bumblebees and photoelectric cells. There is much more to the world than what is visible to us. Beyond the ultraviolet rays is the x-ray part of spectrum and beyond the x-rays are the gamma rays. At lower frequencies, at the other side of red, is the infrared part of the spectrum. Rattlesnakes detect infrared radiation perfectly well. Beyond the infrared is the vast spectral region of the radio waves.

Different molecules and chemical elements absorb different frequencies or colours of light. Cosmic rays play a part in the evolution of humans, animals and plants. To quote Carl Sagan: "A cosmic ray striking a different gene, producing a different mutation, can have small consequences early but profound consequences later."

Other kinds of energy are wind, water, metal, sound, air, radio waves, electricity, alpha, beta, gamma, etc. Energy fills up the universe, outside our body and inside our body. The Chinese refer to this energy as " QI".
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