BIG BANG THEORY
* 15billion years ago, there was a cosmic mass. (smaller than the dot)
* It was made up of hot and dense matter.
* A great explosion shattered the cosmic mass into countless tiny pieces.
* This explosion is known as “Big Bang”.
* The Big Bang resulted in the formation of nebulae.
* In the course of millions of years, the temperature and density of nebulae
increased till the nebulae increased till the nebulae collapsed by itself.* It was made up of hot and dense matter.
* A great explosion shattered the cosmic mass into countless tiny pieces.
* This explosion is known as “Big Bang”.
* The Big Bang resulted in the formation of nebulae.
* In the course of millions of years, the temperature and density of nebulae
* As a result, new stars were born.
* The hydrogen within these stars got converted into helium, sun, star, was born
in this way.
MILKY WAY OR AKASH GANGA
- On a cloudless night, one can see a cluster of stars forming a narrow band in the sky. This is called MILKY WAY OR AKASH GANGA.It is a galaxy containing as many as 1,00,000 million stars. Sun is a medium sized star in the Milky Way galaxy. There are millions of galaxies in the Universe.
LIGHT YEAR
- Universe is vast in size.
- Distances between heavenly bodies cannot be expressed in units like kms or miles
- If you drive on a highway at 60 k.m.s per hour in one hour you may get to Hiriyuru.
Steady speed!
If you keep on driving after 4 hours you would reach Bangalore.Steady speed - no stops - If we could keep on and on - - ---------
- If you could drive to the Moon at 70 miles per hour, 230,000 miles or about 400,000 km, it would take you 3400 hours, or 140 days.
- A light year is the unit adopted for measuring distances in the Universe. A ray of light travels at a speed of 30,000 km per second.
- Light and heat comes from the Sun.
- It is a long way away ! 146 million km
If you could drive to the Sun at 70 miles per hour, it would take over 50 000 days.
= 150 years
– longer than we live ! - Light travels very, very fast!
- It takes 8 minutes for light to reach us from the Sun!
- Light travels 300 000 kilometres through space every second!
- A light year is the distance, which a ray of light would cover in a year’s time.
- After the Sun, the ALPHA CENTAURI is the nearest star to the earth..
Also called PROXIMA CENTAURI & 4.3 light years away.
GALAXY
- Galaxy is a collection of billions of stars, found clustered together due to their own gravity. The arrangement of the stars gives rise to different shapes , consisting of varying numbers of stars.
Nebulae
- They are cloud like formations containing dust and hot gases. They appear as misty patches of light spanning the sky.
- They appear as dark patches or bright luminous clouds, depending on the colour of the sky which forms their background
2 comments:
it is very useful topic.it is being given more life by showing it in graphical way and with pictures.just go through it,it gives you more knowledge about universe,light years,galaxy,constellations and nebula.
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