Does anybody has answers...???

This is about Newton, considered as the greatest scientiest till the times. I was studying gravity and its forces applied in our daily life...i found a few loop-holes in the Newton's Gravitational theory....a few unexplained questions (why?) about the gravity. I'm mentioning here a few what i thought something unusual and lacking in scientific grounds during my study of 'Gravity and its forces'. I'm not trying to question Newton's theory and prove the theory wrong and fake....but its just...what i felt...something lacking or loop-hole....I might not be certain, so..  I would welcome any type of suggestions and explanations related to it...

                                                                                                               

-- > Newton's theory doesn't explain why objects attract each other...means,....Why the gravity is always an attractive force unlike other major forces in nature which are both attractive and repulsive....What i thought about this is ....it just can be a hypothesis of Newton(im not detailing here, how?)

-- >There is no known power source of the gravitational force...which claims to be emanating from earth(planet or just a object with mass). It seems just like a huge mass is emanating energy out of it without any power source....What's providing earth such unending and unlimited power ??? This power seems to b never ending from the numerous centuries and still not diminishing by even 0.1% of its strength. How this is possible ??

-- > This so strong and never-ending energy emanating actually violates our Law of Conservation of Energy, the most basic yet fundamental of modern science.
           This violation of law is generally explained by the improper use of the equation 'work-function' (im not detailing here what is work function and how it works).


There might be more violations or might be no violations....so, all the explanations are welcome....