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In physics, time and space are considered fundamental and can not be defined in other terms. Periodic events and periodic motion, like the apparent motion of the sun across the sky, the phases of the moon, the swing of a pendulum, heartbeats, have long served as standards for units of time.Spacetime is a notion that... |
20 June 2007
08:22 GMT |
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Sir Isaac Newton was an English physicist, mathematician, astronomer, natural philosopher and alchemist, regarded by many as the greatest figure in the history of science. He is probably most famous for describing the laws of universal gravity, after seeing an apple fall from a tree.He's not only famous for his... |
18 June 2007
08:21 GMT |
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X-rays have many uses in some very sensitive areas of technology. They are primarily used for diagnostic radiography and crystallography, but also in astronomy, microscopic analysis and fluorescence.Digital color x-rays are an advancement of this technology and it's used in nuclear physics to search for element... |
24 May 2007
05:13 GMT |
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The popular understanding of the term vacuum is that of a volume of space that contains nothing, or even worse, that doesn't contain air (blame the term - vacuum cleaner - for this misconception).In fact, it is a volume of space that is essentially empty of matter, so that gaseous pressure is much less than sta... |
11 May 2007
05:41 GMT |
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The word Laser is an acronym for "light amplification by stimulated emission of radiation". Lasers are possible because of the way light interacts with electrons. Electrons exist at specific energy levels or states characteristic of that particular atom or molecule. The energy levels can be imagined as rings or orbi... |
17 April 2007
10:25 GMT |
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If you ask professional poker players, they'll tell you that there's no sure method of winning.Statistical physicist Clement Sire - and champion bridge player - has created a model of the poker variant Texas hold 'em that enables him to do everything from predicting the length of a tournament to figur... |
10 April 2007
06:50 GMT |
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Spring is definitely here, Easter is just around the corner, birds are singing, trees are blossoming and children are happily playing in the grass. What a fine day for science this is, isn't it? Well, you could argue it actually is a very unfortunate day for science, but I was in the mood for something education... |
6 April 2007
11:12 GMT |
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A particle accelerator is a device that uses electric fields to propel electrically charged particles to high speeds and to contain them. An ordinary CRT television set is a simple form of accelerator. There are two basic types: linear (in a straight-line) accelerators and circular accelerators.In a linear accelerat... |
31 March 2007
07:09 GMT |
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The US Pioneer program of unmanned space missions was designed for planetary exploration. There were a number of such missions in the program, but the most notable were Pioneer 10 and Pioneer 11, which explored the outer planets and left the solar system. Both carry a golden plaque, depicting a man and a woman and i... |
30 March 2007
08:16 GMT |
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