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Additional
Interstellar medium
English Wikipedia - The Free Encyclopedia
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Interstellar medium
In
astronomy
, the
interstellar medium
(
ISM
) is the
matter
that exists in the
space
between the
star systems
in a
galaxy
. This matter includes
gas
in
ionic
,
atomic
, and
molecular
form, as well as
dust
and
cosmic rays
. It fills interstellar space and blends smoothly into the surrounding
intergalactic space
. The
energy
that occupies the same volume, in the form of
electromagnetic radiation
, is the
interstellar radiation field
.
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