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Thursday, 30 August 2012

Theory of Relativity

 THEORY OF RELATIVITY
The Theory of Relativity, proposed by the Jewish physicist Albert Einstein (1879-1955) in the early part of the 20th century, is one of the most significant scientific advances of our time. Although the concept of relativity was not introduced by Einstein, his major contribution was the recognition that the speed of light in a vacuum is constant and an absolute physical boundary for motion. This does not have a major impact on a person's day-to-day life since we travel at speeds much slower than light speed. For objects traveling near light speed, however, the theory of relativity states that objects will move slower and shorten in length from the point of view of an observer on Earth. Einstein also derived the famous equation, E = mc2, which reveals the equivalence of mass and energy.

When Einstein applied his theory to gravitational fields, he derived the "curved space-time continuum" which depicts the dimensions of space and time as a two-dimensional surface where massive objects create valleys and dips in the surface. This aspect of relativity explained the phenomena of light bending around the sun, predicted black holes as well as the Cosmic Microwave Background Radiation (CMB) -- a discovery rendering fundamental anomalies in the classic Steady-State hypothesis. For his work on relativity, the photoelectric effect and black body radiation, Einstein received the Nobel Prize in 1921. 


BASICS
TWO PARTS OF THEORY OF RELATIVITY.
    • The first is the Special Theory of Relativity, which essentially deals with the question of whether rest and motion are relative or absolute, and with the consequences of Einstein’s conjecture that they are relative.
    • The second is the General Theory of Relativity, which primarily applies to particles as they accelerate, particularly due to gravitation, and acts as a radical revision of Newton’s theory, predicting important new results for fast-moving and/or very massive bodies. The General Theory of Relativity correctly reproduces all validated predictions of Newton’s theory, but expands on our understanding of some of the key principles. Newtonian physics had previously hypothesized that gravity operated through empty space, but the theory lacked explanatory power as far as how the distance and mass of a given object could be transmitted through space. General relativity irons out this paradox, for it shows that objects continue to move in a straight line in space-time, but we observe the motion as acceleration because of the curved nature of space-time.
     

Monday, 27 August 2012

SOLAR SYSTEM

 Solar System

The Solar System consists of the Sun and the astronomical objects gravitationally bound in orbit around it, all of which formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago. The vast majority of the system's mass is in the Sun. Of the many objects that orbit the Sun, most of the mass is contained within eight relatively solitary planets whose orbits are almost circular and lie within a nearly flat disc called the ecliptic plane. The four smaller inner planets, Mercury, Venus, Earth and Mars, also called the terrestrial planets, are primarily composed of rock and metal. The four outer planets, the gas giants, are substantially more massive than the terrestrials. The two largest, Jupiter and Saturn, are composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are composed largely of ices, such as water, ammonia and methane, and are often referred to separately as "ice giants".



  • SUN 


The Sun is the Solar System's star, and by far its chief component. Its large mass (332,900 Earth masses produces temperatures and densities in its core great enough to sustain nuclear fusion which releases enormous amounts of energy, mostly radiated into space as electromagnetic radiation, peaking in the 400–700 nm band of visible light.
The Sun is classified as a type G2 yellow dwarf, but this name is misleading as, compared to the majority of stars in our galaxy, the Sun is rather large and bright.Stars are classified by the Hertzsprung–Russell diagram, a graph that plots the brightness of stars with their surface temperatures. Generally, hotter stars are brighter. Stars following this pattern are said to be on the main sequence, and the Sun lies right in the middle of it. However, stars brighter and hotter than the Sun are rare, while substantially dimmer and cooler stars, known as red dwarfs, are common, making up 85 percent of the stars in the galaxy.
Evidence suggests that the Sun's position on the main sequence puts it in the "prime of life" for a star, in that it has not yet exhausted its store of hydrogen for nuclear fusion. The Sun is growing brighter; early in its history it was 70 percent as bright as it is today.
The Sun is a population I star; it was born in the later stages of the universe's evolution, and thus contains more elements heavier than hydrogen and helium ("metals" in astronomical parlance) than older population II stars.Elements heavier than hydrogen and helium were formed in the cores of ancient and exploding stars, so the first generation of stars had to die before the universe could be enriched with these atoms. The oldest stars contain few metals, while stars born later have more. This high metallicity is thought to have been crucial to the Sun's developing a planetary system, because planets form from accretion of "metals"


  • Mercury☿

mercury-Wikipedia

Mercury (0.4 AU from the Sun) is the closest planet to the Sun and the smallest planet in the Solar System (0.055 Earth masses). Mercury has no natural satellites, and its only known geological features besides impact craters are lobed ridges or rupes, probably produced by a period of contraction early in its history. Mercury's almost negligible atmosphere consists of atoms blasted off its surface by the solar wind.Its relatively large iron core and thin mantle have not yet been adequately explained. Hypotheses include that its outer layers were stripped off by a giant impact, and that it was prevented from fully accreting by the young Sun's energy.

  • VENUSThe Venusian symbol, a circle with a small equal-armed cross beneath it

Venus-wikipedia

Venus (0.7 AU from the Sun) is close in size to Earth (0.815 Earth masses), and, like Earth, has a thick silicate mantle around an iron core, a substantial atmosphere and evidence of internal geological activity. However, it is much drier than Earth and its atmosphere is ninety times as dense. Venus has no natural satellites. It is the hottest planet, with surface temperatures over 400 °C, most likely due to the amount of greenhouse gases in the atmosphere. No definitive evidence of current geological activity has been detected on Venus, but it has no magnetic field that would prevent depletion of its substantial atmosphere, which suggests that its atmosphere is regularly replenished by volcanic eruptions.

  • EarthAstronomical symbol of Earth

Earth-Wikipedia

Earth (1 AU from the Sun) is the largest and densest of the inner planets, the only one known to have current geological activity, and is the only place in the Solar System where life is known to exist. Its liquid hydrosphere is unique among the terrestrial planets, and it is also the only planet where plate tectonics has been observed. Earth's atmosphere is radically different from those of the other planets, having been altered by the presence of life to contain 21% free oxygen. It has one natural satellite, the Moon, the only large satellite of a terrestrial planet in the Solar System.

  • MarsAstronomical symbol of Mars

Mars-Wikipedia

Mars (1.5 AU from the Sun) is smaller than Earth and Venus (0.107 Earth masses). It possesses an atmosphere of mostly carbon dioxide with a surface pressure of 6.1 millibars (roughly 0.6 percent that of the Earth's).Its surface, peppered with vast volcanoes such as Olympus Mons and rift valleys such as Valles Marineris, shows geological activity that may have persisted until as recently as 2 million years ago.Its red colour comes from iron oxide (rust) in its soil. Mars has two tiny natural satellites (Deimos and Phobos) thought to be captured asteroids.

  • JupiterAstronomical symbol of Jupiter

 

 Jupiter-wikipedia

Jupiter (5.2 AU), at 318 Earth masses, is 2.5 times the mass of all the other planets put together. It is composed largely of hydrogen and helium. Jupiter's strong internal heat creates a number of semi-permanent features in its atmosphere, such as cloud bands and the Great Red Spot.Jupiter has 66 known satellites. The four largest, Ganymede, Callisto, Io, and Europa, show similarities to the terrestrial planets, such as volcanism and internal heating. Ganymede, the largest satellite in the Solar System, is larger than Mercury.

  • Saturn

 

 

 Saturn-wikipedia

Saturn (9.5 AU), distinguished by its extensive ring system, has several similarities to Jupiter, such as its atmospheric composition and magnetosphere. Although Saturn has 60% of Jupiter's volume, it is less than a third as massive, at 95 Earth masses, making it the least dense planet in the Solar System. The rings of Saturn are made up of small ice and rock particles.Saturn has 62 confirmed satellites; two of which, Titan and Enceladus, show signs of geological activity, though they are largely made of ice . Titan, the second-largest moon in the Solar System, is larger than Mercury and the only satellite in the Solar System with a substantial atmosphere.

  • UranusAstronomical symbol of Uranus

 

 Uranus-Wikipedia

Uranus (19.6 AU), at 14 Earth masses, is the lightest of the outer planets. Uniquely among the planets, it orbits the Sun on its side; its axial tilt is over ninety degrees to the ecliptic. It has a much colder core than the other gas giants, and radiates very little heat into space.Uranus has 27 known satellites, the largest ones being Titania, Oberon, Umbriel, Ariel and Miranda.

  • Neptune Astronomical symbol for Neptune.

 

Neptune-Wikipedia

Neptune (30 AU), though slightly smaller than Uranus, is more massive (equivalent to 17 Earths) and therefore more dense. It radiates more internal heat, but not as much as Jupiter or Saturn.Neptune has 13 known satellites. The largest, Triton, is geologically active, with geysers of liquid nitrogen. Triton is the only large satellite with a retrograde orbit. Neptune is accompanied in its orbit by a number of minor planets, termed Neptune trojans, that are in 1:1 resonance with it.

 




INCREDIBLE INDIA

 INDIA

Indian Tricolor

Capital: New Delhi
Dialing code: 91
GDP: US$ 1.848 trillion (2011)
Population: 1,241,491,960 (2011)
Official language: Hindi, English
Government: Parliamentary system, Democracy, Republic, Constitutional republic, Federal republic
Independence : 15 Aug 1947 from United Kingdom  
Republic::26 Jan 1950
Population :1,210,193,422 (2011 census)
Nehru and Mahatma Gandhi
Rashtrapati Bhavan (official residence of president if India)






National symbols
Flag Tricolour
Emblem Sarnath Lion Capital
Anthem Jana Gana Mana
Song Vande Mataram
Calendar Saka
Game none
Flower Lotus
Fruit Mango
Tree Banyan
Bird Indian Peafowl
Land animal Royal Bengal Tiger
Aquatic animal River Dolphin
River Ganga (Ganges)











The Indian economy is the world's eleventh-largest by nominal GDP and third-largest by purchasing power parity (PPP). India became one of the fastest-growing major economies; it is considered a newly industrialized country.
Major Places to Visit



Taj Mahal
Lotus Temple





















































































































India Gate

Sunday, 26 August 2012

Death of Neil Armstrong.

 Neil Armstrong - the first man to set foot on the Moon - has died at the age of 82.
  •  August 25, 2012, Columbus
We now have generations of people who have grown up with the knowledge that humans have walked on the Moon. Neil Armstrong, the man who took that first small step on another world passed away today after complications from heart surgery. It’s a tremendous loss for everyone involved with or interested in space exploration, and messages of condolences and remembrances are pouring in.


Neil Armstrong

follow your dreams

Some people dream of success while others wake up and work hard at it.

Every great dream begins with a dreamer. Always remember, you have within you the strength, the patience, and the passion to reach for the stars to change the world.

Reach high, for stars lie hidden in your soul. Dream deep, for every dream precedes the goal.

dream it...& do it....



 

Saturday, 25 August 2012

time and space

The Concept
Space and time are great inventions of the mind to help it comprehend the world, at least in the scale range of our experience. But what could be the source in nature that led to the evolutionary development of these two tenacious and extremely useful perceptions? I have hypothesized that a single entity in nature , which, for convenient reference, I will call “tise,” underlies both of these perceptions. Tise is all of what we perceive as space and time. Tise is comprised of infinitesimally small quanta, which I will call “tisons.” I introduce the words “tise” (from TIme SpacE) and “tison” reluctantly, but necessarily, because tise is conceptually very different from the spacetime of modern physics.
If we could somehow observe tisons, they would appear to us to travel in a straight line at the speed of light. In a sense, we can observe them as light rays, which, in this concept, are comprised of energized tisons. (To be more precise in reference to this concept, I should use the term “speed of tisons” rather than “speed of light," but will stay with the latter, more familiar, term.)
Although tise is based on probability rather than determinism, it may not conflict with the predictability of relativity theory as discussed later, and, on a small scale, it may ultimately offer a solution to the need for background-independent formulation of string theory.
In this concept, tisons are the carriers of light and all other electromagnetic energy. A light photon, for example, may then be considered as a string of tisons energized by a quantum of light. Neutrinos, in this concept, also consist of energized tisons. Although tisons are too small to ever be detected, we can visualize tise simply by seeing light in a new and radically different way. Instead of thinking of light as energy quanta emitted from a source such as a lamp, we can visualize it as energy quanta transferred from the source to the innumerable tisons passing through the source in every direction. Tise, then, is what radiates throughout the universe, and radiant energy is composed of energized tisons. Electromagnetic energy then has no inherent velocity and the term “radiation” takes on a different meaning. It is tise that radiates; energy gets a free ride.
In the generation of electromagnetic waves by an antenna, whenever a charged particle is accelerated, it is said to radiate energy. In the tise concept, it simply releases energy to tisons passing through in all directions.
This question naturally arises: how can tisons be carriers of energy if tisons appear to travel in straight lines at the velocity of light while energy is so easily redirected, slowed or absorbed? In this concept, energy quanta exchange among tisons whenever the energy is redirected by any means, such as reflection, refraction, diffraction or dispersion. The tisons maintain their directions as the energy transfers to other tisons having the new directions of the energy quanta, or as the energy quanta are slowed or absorbed while passing through any form of matter. Just as certain electromagnetic energy (e.g. light) quanta are released by matter and, in this concept, transferred to tisons passing through, other arriving energy quanta are absorbed by matter.
If space and time are not part of nature, why do we perceive them? As the brain evolved various perceptions of energy such as color and "solid" matter, it also evolved the perceptions of tise as space and time. Assuming that the tise concept is valid, I cannot imagine any different result of evolution of its perception in conscious beings with senses such as ours. Certainly, because such beings could not sense tise or tisons in any way, evolutionary development of direct perception of the nature of tise would be impossible.
Because of our ingrained evolved perceptions, it is not easy for us to visualize space and time, on a small scale, as different perceptions of a single entity. However, let us consider that we have no difficulty in thinking of the distance to a star in a time-related term, i.e. light-years.
Tise is, of course, entirely different from the discredited static ether concept of old. Tise is the dynamic fabric of the universe. In the following text, I will discuss the tise concept as not only an alternative to the concept of spacetime, but also as a quantized modification of both special and general relativity.
Although the tise concept may be indistinguishable from the relativity theories in respect to predictability, there are two fundamental differences between them. One is that the spacetime of relativity was derived mathematically not from any basis in mind-independent nature but rather from the evolved perceptions of space and time, whereas, conversely, the tise concept is based on the hypothesis that tise is the source in nature of those evolved perceptions. The other difference is, of course, that relativity is based on determinism whereas tise is probabilistic.
The tise concept, incidentally, conforms to Occam's razor, one translation of which is: “One should not increase, beyond what is necessary, the number of entities required to explain anything.” This concept requires only a single entity to explain the nature of our space and time perceptions. Even spacetime requires two entities (space and time) for its derivation.
In this concept, since all electromagnetic radiation is energized tisons, the somewhat abstract concept of electromagnetic field might be replaced by the more concrete concept of electromagnetically energized tise. In any case, Maxwell's equations, as well as many other basic equations of physics, would need to be reformulated, for basic science purposes, to obviate the perceptions of space and time, which are incorporated in existing formulations.
I do not mean to imply that the concepts of space, time and spacetime should be excluded from all scientific studies. However, in the search for the ultimate unification of physics, I submit that space, time and even spacetime, as perception-based concepts outside the scope of mind-independent nature, should be put aside.
I submit that Einstein might have arrived at this tise concept if he had not been so sure that “God does not play dice”, and if he had considered more fully the role of evolution of the brain in perceptions of nature. Indeed, he appears to have come close to the tise concept in his statement:
“But it must now be remembered that there is an infinite number of spaces, which are in motion with respect to each other .The concept of space as something existing objectively and independent of things belongs to pre-scientific thought, but not so the idea of an infinite number of spaces in motion relative to each other. The latter idea is logically unavoidable, but is far from having played a considerable role even in scientific thought.” (Einstein, p.139, my italics.)
If Einstein had just thought instead of “the idea of an infinite number of quanta of the source of our space and time perceptions, in relative motion to each other,” he may soon have achieved his goal of a unified theory.