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Additional
nebula
English Wikipedia - The Free Encyclopedia
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Nebula
A
nebula
(
Latin
for "cloud"; pl.
nebulae
,
nebulæ
, or
nebulas
) is an
interstellar cloud
of
dust
,
hydrogen
,
helium
and other
ionized gases
. Originally,
nebula
was a name for any diffuse
astronomical object
, including
galaxies
beyond the
Milky Way
. The
Andromeda Galaxy
, for instance, was referred to as the
Andromeda Nebula
(and
spiral galaxies
in general as "spiral nebulae") before the true nature of galaxies was confirmed in the early 20th century by
Vesto Slipher
,
Edwin Hubble
and others.
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