THE INTERSTELLAR MEDIUM AND
THE BIRTH OF STARS
There are vast quantities of gas and dust between stars in the disk of the Milky Way Galaxy.
Different kinds of clouds are observed using
maps of the Milky Way
made at different wavelengths of light.
A dense part of the interstellar medium is called a NEBULA.
Constituents of the ISM include:
ATOMIC HYDROGEN
DUST
MOLECULAR GAS