A nuclear explosion on Earth generates an electromagnetic pulse that travels away from the Earth. A long distance from Earth, scientists on an alien planet named Tutheleftaya, a distance LL from the Earth, detect the pulse. Since the pulse travels at the speed of light, they detect it at time t=L/ct=L/c after the pulse was created on Earth. Another group of scientists on another alien planet, named Offtatheright, which is also a distance LL away from the Earth, but in the opposite direction, also detect the pulse. Since they are the same distance from the Earth, they detect it at the same time as the scientists on Tutheleftaya. In the reference frame of someone traveling on a spaceship going from the Earth to Tutheleftaya, and about halfway there when the explosion happens, which group of scientists detects the pulse first?