The Universe which we know only comprises 5% of total mass and energy, the remaining 95% is dark matter and dark energy .
In CERN, scientist actually trying to form dark matter in LHC to know more about it .
Lets go through the topic .
- Dark matter
- how Dark Matter discover
- what we don’t know about dark matter
- DARK ENERGY
- what we know about Dark Energy
- what dark energy is (may be)
Dark Matter
It is hidden mass which cannot interact with ordinary matter directly , the only effect we know about it is adding additional gravity t o stars, galaxy and other objects.
How would we discover Dark Matter ?
Scientist had saw that there is majority of small galaxy which do gravitational lensing ( which only happen with heavy , big galaxy ) .They also discover that all the stars in galaxy have almost equal revolving speed.
This contradict newton’s universal law of gravity ( why? , as further away the object from center slower it had to remain in orbit).
This all signify something is not good , we come up with two possibilities.
- There is something wrong with newton’s gravitational law.
- There is some mass hidden which add to newton’s equation.
Newton’s law is very well defined . Thus scientist had choosen second option that there is some hidden mass all around the universe .
( we still isn’t prove it )
what we don’t know about Dark Matter ?
- How it form in universe.
- what is its fundamental properties and structure.
- is it interact with themself.
Dark Energy
Dark Energy symbolis the unknown hidden energy present in universe causing it to expand, It comprise about 68% of total mass and energy .
It is hidden energy which work opposite to gravity causing acceleration in expansion of universe.
When scientist observe the distance galaxy they surprised to see that galaxy are rushing away from us , there must be certain force or energy which work agains gravity also further the galaxy is faster is it moving away from us this emphasize energy must present in spacetime fabric.
What we know about Dark Energy ?
- Repulsive in nature for masses.
- Present in spacetime fabric throughout the universe.
- Energy density remain constant even after expansion.
Probability what Dark Energy is ?
- It may be fifth fundamental force.
- It may be the energy corresponding to cosmological constant ( repulsive gravity type )
- It may be just property of space to form new space continuously.
Dark Matter and Dark Energy remind as that we are beginners in journey to the universe and there is millions of secret waiting to be discover .
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