Concept
Warm Neutral Medium
Diffuse warm hydrogen filling much of the galaxy.
A pervasive phase of the ISM made of neutral hydrogen around 6,000–10,000 K, traced by the 21 cm radio line.
Overview
A pervasive phase of the ISM made of neutral hydrogen around 6,000–10,000 K, traced by the 21 cm radio line.
See also
Big Bang Nucleosynthesis
The first few minutes that forged hydrogen and helium.
Cold Neutral Medium
Cool, denser neutral hydrogen clouds.
Warm Ionized Medium
Diffuse ionised gas spread through the galactic disc.
Interstellar Dust
Microscopic grains permeating the galaxy.
Moving Group
Stars sharing a common motion through the galaxy.
The Big Bang
How everything began, 13.8 billion years ago.