what property is the same for all electromagnetic waves that travel through space?
All electromagnetic waves traveling through space (a vacuum) have the same speed : the speed of light, approximately 3.0×1083.0\times 10^83.0×108 m/s.
All electromagnetic waves traveling through space (a vacuum) have the same speed : the speed of light, approximately 3.0×1083.0\times 10^83.0×108 m/s.