Physics
The mass of a star is two times the mass of the Sun. How it will come to an end ?

Neutron Star
Red Giant
White Dwarf
Black hole

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Physics
We always see the same face of the moon, because

It revolves on its axis in adirection opposite to that ofthe earth
It takes equal time for revolution around the earth and rotation on its own axis
It is smaller than the earth
It rotates at the same speed as the earth around the sun

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