It's a matter of understanding orbital insertion -- why you can't just throw a baseball into orbit (with a slingshot thingy) -- you need a second push.
A "one-shot" push will create an elliptical orbit that returns through its origin position -- not good for a useful orbit.
A useful orbit needs a minimum of 2 pushes -- the second being the orbital insertion burn.
It's a matter of understanding orbital insertion -- why you can't just throw a baseball into orbit (with a slingshot thingy) -- you need a second push.
A "one-shot" push will create an elliptical orbit that returns through its origin position -- not good for a useful orbit.
A useful orbit need a minimum of 2 pushes -- the second being the orbital insertion burn.