Lets say there was a vacuum cylendar straight off of the Earth that reached far past the son, lets just say it went an infinite distance away. So if I drop an object lets say a pen in the vacuum going towards the Earth and it was falling at the acceleration due to gravity. (9.8m/s2) And if there is no terminal velocity in a vacuum shouldnt the pen keep accelerating? So if it keeps accelerating then could the pen reach the speed of light? If I drop a pen in an infinite length vacuum that had the gravitational pull of the Earth, will the pen reach the speed of light?