for atoms,we say that its ionised means its electrons are free and often we say in equations while equating energy that ergy of electron becomes zero coz we considered it to be at infinity........
further in gravitation also we consider E at infinity=0???i mean irrespective of the size,ie,whether its heavenly body or microscopic!!we generalise it....but!!!
atoms also have orbit(shell) and planets are also no exception!!and for atoms i am sure electron need not to travel light years to be at infinity BUT JUST A DISTANCE WHICH COULD MAKE IT FREE FROM THE PULL OF NUCLEUS OF ATOM.....*but how god could do such an injustice that "infinity varies from individual to individual",I MEAN HE IS NOT THAT MUCH CHEAP THAT FOR OBC Infinity is 2/0,FOR SC ITS 3/0,FOR HOME STATE ITS 1/0,FOR SCPH ITS 5/0 ...AND FOR GENERAL ITS 0/0(INDETERMINATE AND THEY ARE MEANT TO BE F*****)
{THEIR IS DIFFERENCE between them,infinity is where mathematics failed and indeterminate means which cannot be determined,but through limits we can do something}
OK WATEVER!!!IT MEANS THAT WE CAN EXPLORE SECRETS IN LABORATORY???NO NEED OF SPACESHIPS which is suppossed to increase its speed as it goes on and ultimately crossing c(ya disscussion is going on to have one like this).............well all i can say is.....
BLA BLA BLA..BBRRRRRRRRRR???!!!;':?.,<>(*#&$%^@@#%(}_+={{}{"ly#$y#f#$wt$#y^t