Which of the following statements about matter-antimatter engines is not true?
A. Matter-antimatter engines would be great in theory, but to date we have no evidence that antimatter even exists.
B. Matter-antimatter reactions represent the most efficient possible reactions in terms of energy release.
C. Spacecraft powered by matter-antimatter engines could probably reach speeds of more than half the speed of light.
D. One of the major challenges to developing matter-antimatter engines is finding a way to store antimatter after it is produced.
Answer:A
Which of the following statements about matter-antimatter engines is not true?
A. Matter-antimatter engines would be great in theory, but to date we have no evidence that antimatter even exists. B. Matter-antimatter reactions represent the most efficient possible reactions in terms of energy release. C. Spacecraft powered by matter-antimatter engines could probably reach speeds of more than half the speed of light. D. One of the major challenges to developing matter-antimatter engines is finding a way to store antimatter after it is produced.