Gravity, acceleration and more reader feedback

Grasping gravity

An illustration of an accelerating space rocket in Tom Siegfried’s essay “Getting a grip on gravity” (SN: 10/17/15, p. 16), explained that a clock at the top of the ship would tick faster than one at the bottom thanks to gravitational time dilation. A few perplexed readers argued that acceleration aboard the rocket ship would be the same for both clocks, so they should tick at the same rate.