A velocity approaching that of light. For example, high-energy cosmic-ray particles move at relativistic velocities. At such velocities, the mass of an object becomes significantly greater than its rest mass.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。