Why do galaxies rotate ??

 Because galaxies were born spinning, and nothing in space stops them.

Logical explanation   -----

*1. Everything in Universe Was Born From a Spin*

- Big Bang threw gas everywhere. Gas was not perfectly still. Small random movement.

- That gas cloud that made our galaxy - it was huge, light-years wide, and had a tiny, tiny spin. Like a slow merry-go-round.

*2. Ice Skater Effect - Conservation of Angular Momentum*

- That huge cloud collapsed under its own gravity to make stars.

- When big thing shrinks to small thing, it spins FASTER to keep its spin power same.

- Example: Ice skater - arms wide = slow spin. Arms close = fast spin.

- So huge slow cloud -> small galaxy = much faster spin.

*3. Nothing Stops It*

- On Earth, a spinning top stops because air and friction.

- In space, there is NO air, NO friction. So once it spins, it spins forever. For 13 billion years.

Why It Matters - The Mystery:

If we  calculate speed, stars on edge of galaxy should spin SLOWER than center (like planets - Mercury fast, Neptune slow).

But *stars on edge spin FAST - same speed as middle  !!!

That is why we discovered *DARK MATTER*.

- Visible galaxy mass is only 15%

- Invisible Dark Matter halo is 85% - Like invisible glue, adds extra gravity, holds fast-spinning outer stars from flying away.

> *Galaxy rotates because mother cloud was rotating, collapsed and sped up, and no friction to stop it.*

Without rotation, all stars would fall straight into center black hole. Rotation is what keeps galaxy spread out as disk.

Which piece in chess ??

 This question was asked on Koun Banega Karodpati program.

Question 

Rook and which of these pieces are moved during castling in chess  ??

1.  King

2.  Knight 

3.  Queen 

4.  Bishop 

Answer 

It is KING  !!!

Castling is a special defensive move to protect King and bring Rook into play .

It is the only move in chess where 2 pieces are moved at once and it helps to keep King safe in the corner.

But there are many conditions  ----

1.  Neither the Rook nor the King have already moved.

2.  There muat not be any other pieces between Rook and King.

3.  King must not be (  currently   )  in check.

Bheja Fry Question

  Monica purchased a pressure cooker at 9/10th of its selling price.  Later she sold it at 8% more than its selling price.

What is her gain percentage  ??

In the first, we assign a value to original selling price.

Let us assume that original selling price of cooker is Rs 100.

Monica bought it at 9/10 th of original selling price.

==>>  cost price  =  9/10  *  original selling price

==>>  cost price =  9/10  *  100

==>>    cost price  =   90.

Monica sold the pressure cooker at 8% more than its original selling price.

==>>  New selling price  =  original price + 8% of original price 

==>>                = 100  +   8%of 100

==>>  New selling price =  100  +  8

==>> New selling price  =  108

This means Monica bought the cooker at  90 and resold it at  108.

Her gain =  108 -  90  =  18

To find out gain percentage,

Gain percentage  =   18/90  * 100

==>>          1/5   *  100

==>>     Gain percentage  =  20%    !!!

Which capital city was earlier named EDO ??

 This question was asked on Koun Banega Karodpati program.

Question 

Until 1869, which Asian capital city was known as  EDO  ??

1.  Seoul 

2.  Pyongyang 

3.  Tokyo

4.  Beijing 

Answer 

Until 1869, TOKYO  was called  EDO   !!!

Till 1869, EDO was a small fishing village. In 1869, power has been handed over to emperor.

Emperor officially declared it as the capital of Japan and was named Tokyo  !!!

Tokyo  =  Eastern capital 

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