Idon't understand why ppl put the questions up here but don't give the answers

Well, if you ask a question, it's usually because you don't know the answer.
You hope that someone else is able to supply the answer.

What do you mean? 

Did you mean when someone posts a question and no one helps and it stays up for days and still no one helps

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!

Why the planet stays in orbit is because of inertia (object stays in motion until a force changes it’s motion) also the atmosphere and gravity!