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Q1. What is an Universe?

The totality of everything that exist - the cosmic, geological and physiological features.

Q2. How many theories are there regarding the origin of the universe?

Three -

1. Big Bang

2. Oscillating

3. Steady State.

Q3. Among these three theories, which is the most accepted one?
The Big Bang Theory.
Q4. What does the Big Bang theory convey?
It conveys that the Universe had its origin through a giant explosion some about 18 million years ago. The matter flung out of this explosion grows old the matter in it thins out. The expansion continues indefinitely.
Q5. What does the "Oscillating" theory convey?
It is actually an extention of the Big Bang theory and suggests that the expansion of the universe will eventually slow down and stop, followed by the contraction of the galaxies into another Big Bang. The Universe therefore, continues in endless cycles of expansion and contraction with the laws of nature differing in each cycle.
Q6. What does the "Steady State" theory convey?
It is a contradiction of the Big Bang. It suggests that the Universe never originated at any one instant nor will it ever die. It further suggests that as the Universe expands, new matter is created and fills the space left. Thus the appearance of the Universe remains constant with the time.
Q7. Name the Indian Astronomer who disputed the Big Bang Theory?

Jayant V.Narlikar. A world famous Astrophysicist from Kolhapur, Maharashtra. He is a Padma Vibhushan awardee.

Q8. The term LHC has been in the news for sometime now. What is it?

LHC stands for Large Hadron Collider. It has been in the news, as it attempts to recreate the conditions just after the Big Bang.

Q9. What is the term by which the expansion of the Universe is measured?

HUBBLE CONSTANT : It is the name for the astronomical observation in physical cosmology that ---
1) all objects observed in deep space (interstellar space) are found to have a "Doppler shift" observable relative velocity to Earth, and to each other, and
2) that this "Doppler shift" measured velocity, of various galaxies, receding from the Earth and all other interstellar bodies. In effect, the space time volume of the observable universe is expanding and Hubble's Law is the direct physical observation of this process. The law is often expressed by the equation V = HoD with Ho the constant proportionality (the Hubble Constant) between the "proper distance" D to a galaxy (which can change over time, unlike the commoving distance) and its velocity v (i.e the derivative of proper distance with respect to cosmological time coordinate).
3) In simple terms, it means "a ratio expressing the rate of apparent expansion of the Universe, equal to the velocity at which a typical galaxy is receding from earth divided by its distance from Earth".
The law was derived from the "General Relativity" equations by Georges Lemaitre in 1927, roughly suggesting an estimated value of the rate of Expansion (to be called as Hubble Constant later). In 1929, Edwin Hubble confirmed the existence that law and determined a more accurate value for the constant which is now known by his name.