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It's my own work, originated from another forum.

It's my own work, originated from another forum.

Original Article : http://sciencerealm.net/index.php?tid=41 Neptune, the 8th planet in our solar system was first seen by the famous Galileo Galilei on December 1612. Galileo wasn't confirm with his discovery because of the limited capability of the telescope at his time. He noted down the shining spot he observed next to Jupiter as a "fixed" star, rather than a planet revolving the Sun. More than 2 centuries had passed, with the help of Newton's Gravitational Law or Law of Motion, scientist and astronomers begin their search of fantasies in heavenly space. From the observation of Uranus, astronomer noticed that there's a perturbation on its orbit. From the equations and observations, suggestion has been made that there should be a major planet yet to be discovered behind Uranus, that this planet exerts a gravitational force to pull Uranus back. Using equations from Newton's Law of Motion, astronomers predicted some hotspot for this major planet to be found. On September 23, 1846, Neptune was discovered by Johann Gottfried Galle at Berlin Observatory. This discovery has marked the first planet that is discovered and predicted using mathematics and observations on existing planets. The trend has go off, and astronomers begin to observe the behaviour of Neptune. Surprisingly, they found similar perturbations on Neptune's orbit. Enthusiasm drives them to look for the 9th planet. Percival Lowell made his famous "Planet X Hypothesis" after his observation on Trans-Neptunian objects. After almost a century, on 1930, Pluto is discovered and seems to be able to explain Lowell's prediction, until 2006 where IAU (International Astronomical Union) has made the final judgement that Pluto should be categorized as dwarf planet. Pluto has been drop off from the title planet since then. Lowell's followers continues the search for Planet X where there's much discovery to be claimed as Planet X, but none of them has been approved so far. Recent observations shown that there're discrepancies on Neptune's mass and also its orbit. Recalculating, astronomers agreed that there's not a need for Planet X to exist to explain Neptune's orbital behaviour. However, the idea of Planet X still goes on.... Some claimed discovery of Planet X: http://science.nasa.gov/headlines/y2005/29jul_planetx.htm - by Michael Brown, 2005 http://afp.google.com/article/ALeqM5gD2yjCVCevAgLFa_AXH9m51MrqCg - by Japan astronomers Welcome to express your view on Planet X. Original Article url deleted

Original Article : url deleted Holography is a type of data recording technique used, primarily for image recording. Holography is so famous because it can record the image in 3 dimensional wise. Also it's also proven to have higher capacity than conventional storage method. You'll most likely to find it in your ID card, where a logo is imprinted on your card. Holography was discovered in 1947 by Hungarian physicist Dennis Gabor (1900–1979) work for which he received the Nobel Prize in Physics in 1971. The theory behind holography is the interference of light. A monochromatic light is split into 2 equal and coherent beam by mean of a beam splitter, which one of these beam is shone on the object. The lights scattered by the object will be collected on the recording medium, which is our hologram, while the other beam will be scattered by a diverging lens and directed to the hologram. Interference of these 2 lights will create a hologram of different intensity, based on the information carried by the first light. These different intensity appears to our naked eye as a 3D-liked object on a 2D medium. Based on the diagram above, a laser is focus by a shutter and split using a beam splitter. The usage of a diverging lens is to scatter the light so that it can be recorded as a whole in hologram. Recent advancement of this technology has been used on digital disc recording, this type of disc is called optical disc and believed to have a minimum storage of 500GB. Also, the cost to produce such disc is much lower than conventional DVD or Blu-Ray, making holography technique a boost in information technology field. Original Article : url deleted