non-human intelligent life

Type: Concept

As of November 2026, non-human intelligent life has been mentioned in one podcast episode on The Diary Of A CEO (May 2026). The existence of non-human intelligent life is a major theme, questioning the implications for humanity.

The hydrogen line, 21 centimeter line, or H I line is a spectral line that is created by a change in the energy state of solitary, electrically neutral hydrogen atoms. It is produced by a spin-flip transition, which means the direction of the electron's spin is reversed relative to the spin of the proton. This is a quantum state change between the two hyperfine levels of the hydrogen 1 s ground state. The electromagnetic radiation producing this line has a frequency of 1420.405751768(2) MHz (1.4