the solar system and outside

According to Newton's laws of motion, they work in gravity and objects, but in tiny atoms or celestial bodies, we use the laws of Einstein, which has a huge constant as well as speed, but I think that is not enough. We have the solar system we live in. If we go out to other groups and galaxies, Gravity differences We are extraterrestrial in our solar system. Gravity is weak. It may differ from one planet to another in differences of weakness, but we did not get out of our solar system and try any attraction. Or maybe we walk without a lighter gravity than the Earth and we are lighter than our solar system in thousands of miles per second and there is no time but we did not try to get out of the solar system and maybe a barrier outside it is not possible or the man flies to the end in an instant and NASA and its brothers in russia, China and Europe try to get out of the solar system and Science to try and do not know what the result?