Today i want to tell you about the expansion of universe. In your kitchen cabinet, you've probably got a spray bottle with an adjustable nozzle. If you twist the nozzle one way, it sprays a fine mist into the air. You twist
the nozzle the other way, it squirts a jet of water
in a straight line. You turn that nozzle to the exact
position you want so you can wash a mirror, clean up
a spill, or whatever.
If the universe had expanded a little faster, the matter would have sprayed out into space like finemist from a water bottle - so fast that a gazillion
particles of dust would speed into infinity and never even

The first key idea dates to 1916 when Einstein developed his General Theory of Relativity which he proposed as a new theory of gravity. His theory generalizes Isaac Newton's original theory of gravity, c. 1680, in that it is supposed to be valid for bodies in motion as well as bodies at rest. Newton's gravity is only valid for at rest or moving very compared to the speed of light.

is homogeneous and isotropic when averaged over very large scales. This is called the Cosmological Principle. This assumption is being tested continuously as we actually observe the distribution of galaxies on ever larger scales.

The accompanying picture shows how uniform the distribution of measured galaxies is over a 30° swath of the sky. In addition the cosmic background radiation, the remnant heat from the Big Bang, has a temperature which is highly uniform over the entire sky. This fact strongly supports the notion that the gas which emitted this radiation long ago was very uniformly distributed. The Big Bang model of cosmology rests on two key ideas that date back to the

early 20th century: General Relativity and the Cosmological Principle. By assuming that the matter in the universe is distributed uniformly on the largest scales, one can use General Relativity to compute the corresponding gravitational effects of that matter. Since gravity is a property of space-time in General Relativity, this is equivalent to computing the dynamics of space-time itself.

Before we discuss which of these three pictures describe our universe (if any) we must make a few disclaimers: Because the universe has a finite age (~13.7 billion years) we can only see a finite distance out into space: ~13.7 billion light years. This is our so-called horizon. The Big Bang Model does not attempt to describe that region of space significantly beyond our horizon - space-time could well be quite different out there.It is possible that the universe has a more complicated global topology than that which is portrayed here, while still having the same local curvature.

The Big Bang did not occur at a single point in space as an "explosion." It is better thought of as the simultaneous appearance of space everywhere in the universe. That region of space that is within our present horizon was indeed no bigger than a point in the past. Nevertheless, if all of space both inside and outside our horizon is infinite now, it was born infinite. If it is closed and finite, then it was born with zero volume and grew from that. In neither case is there a "center of expansion" - a point from which the universe is expanding away from. In the ball analogy, the radius of the ball grows as the universe expands, but all points on the surface of the ball (the universe) recede from each other in an identical fashion. The interior of the ball should not be regarded as part of the universe in this analogy. By definition, the universe encompasses all of space and time as we know it, so it is beyond the realm of the Big Bang model to postulate what the universe is expanding into. In either the open or closed universe, the only "edge" to space-time occurs at the Big Bang (and perhaps its counterpart the Big Crunch), so it is not logically necessary (or sensible) to consider this question.It is beyond the realm of the Big Bang Model to say what gave rise to the Big Bang. There are a number of speculative theories about this topic, but none of them make realistically testable predictions as of yet.

The three main theories put forward to explain the origin and evolution of the universe are:
1.The Big Bang Theory2.The Steady State Theory3.The Pulsating Theory 1.The Big Bang theory
The Big Bang Model is a broadly accepted theory for the origin and evolution of our universe. It postulates that 12 to 14 billion years ago, the portion of the universe we can see today was only a few millimeters across. It has since expanded from this hot dense state into the vast and much cooler cosmos we currently inhabit. We can see
remnants of this hot dense matter as the now very cold cosmic microwave background radiation which still pervades the universe and is visible to microwave detectors as a uniform glow across the entire sky.
Big bang theory was supported by 2 theories, General theory of relativity and The cosmological principle.

A study of the celestial bodies and the universe is called "astronomy". One who is engaged in studying various aspects of the orbs like the sun, moon, stars, and universe and in unraveling the secrets hidden in space is an "astronomer".

Astronomy is a wonderful science. The Indian scientist, "C.V.RAMAN" (1888-1970), who won the noble price for Physics in 1930, said at a meeting of the Indian academy of sciences, "Let me say here and now, my belief is that there is no science as grand, so elevating, so intensely, interesting as astronomy... I think a man who does not look at the sky even through that modest equipment- a pair of binoculars- cannot be called an educated person because he has missed that most wonderful thing, and that is the universe in which he lives".

Some times,certain things happen in life,like chasing beautiful flies,that take us far,far away and stir the flightly imagination.This blog also takes us on an amazing journey through space,find out about the stars, the planets, the galaxies, the origin of universe, and the Space Rumors that you heard or you want to know from this blog.

INTRODUCTION

TWINKLE TWINKLE
Twinkle Twinkle Little Star!
How I Wonder What You Are
Up Above The World So High
Like A Diamond In The Sky!

A familiar nursery rhyme!Perhaps the first rhyme to be taught to every child, this small poem is a beautiful expression of the excitement of a little child who looks at the night sky
studded with numerous stars. This wonder seldom diminishes when the child grows up in to an adult. Instead he may well develop a strong desire to know what these stars are made of, how remote they are, who
placed them at such a distance and how they keep on shining for so long.

We live in an enormously large space- the UNIVERSE.
It is only natural that we would want to
understand this place, so scientists and engineers
have developed instruments and space crafts that
have told us far more about the universe than we could possibly imagine.

Apart from these,there are my raid other objects, invisible to the naked eye, whirling round in the vast, black emptiness which we call OUTER SPACE. This space and all the things in it make the magnificent universe. Another important point in SPACE RUMORS is tending to problems beyond every day and usual concerns. The pollution of the environment, destruction of forests, the extinction of various flora and fauna, the disappearance, of the ozone layer and similar cases have been mentioned as dangers which face the whole of the planet earth and its inhabitants.

Chandrayaan : India's Moon Mission

The Elegant Universe - Einstein's Relativity

Black Holes: Creation & Consumption of Galaxies.