If we bring something entirely to a stop with respect to the sun at 1 AU from the sun, and considering only gravity from the sun, it will fall to the sun. I calculated that it would then reach the corona with a velocity of something like 619km/s. When I was reviewing this in my textbook the book says this is "impractical" because of the amount of energy it would take? But isn't the whole point that the sun is doing all the work to increase the objects kinetic energy? How is this impractical? Thanks!