Two spaceships can travel in any direction. Each ship carries equipment to measure the speed of light coming from any targeted star. In one experiment, each ship travels at a constant speed and they measure the speed of light from the same star. Which of the following statements is correct? a. If the spaceships travel in a direction perpendicular to the direction of the incoming light, they both measure a light speed of zero. b. No matter in what direction each spaceship travels, they measure a light speed of c. c. For each ship to measure a light speed of c, both ships must travel in the same direction but they can have unequal speeds. d. If the spaceships travel parallel to the incoming light, but in opposite directions, the ship travelling towards the star measures a greater speed of light.

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