to know how far away the star is. 3. A rocket is moving at 1/4 the speed of light relative to Earth. At the center of this rocket, a light suddenly flashes. To an observer at rest on Earth, A) the light will reach the front of the rocket at the same instant that it reaches the back of the rocket. B) the light will reach the front of the rocket before it reaches the back of the rocket. C) the light will reach the front of the rocket after it reaches the back of the rocket. 4. An astronaut in an inertial reference frame measures a time interval At between her heartbeats. What will observers in all other inertial reference frames measure for the time interval between her heartbeats? ) B) more than At C) less than At D) The answer depends on whether they are moving toward her or away from her