exhilaration
发表于 2025-3-30 08:13:43
Basics, in the distribution of galaxies and quasars and, finally, a distant region: the fireball. Its radiation is that of a black body, with a temperature of 2.73 K now. The fireball is apparently opaque; we cannot see behind it. With consideration and care, we call the space within this fireball and the
Allergic
发表于 2025-3-30 12:29:50
Relativity,torical time span of observation itself. In addition, nearly all observations concern light. This situation requires a consistent theory of motion for speeds of the order of magnitude of the speed of light, and that theory is the theory of (special) relativity (special relativity theory, SRT).