Astrophysics (index)about

cloud

(interstellar cloud)
(higher-density region of space)

The term cloud (or interstellar cloud) in astronomy is used to refer to regions with a higher density of gas or dust. Some have been visible and observed over the centuries, originally termed nebulae (as were visible galaxies and stellar clusters).

Among the types of clouds:

Star formation takes place within clouds (star-forming regions) that have grown cool and dense, some terms being:

Other terms for various kinds clouds (in some cases, classified by appearance from Earth):


(object type)
http://en.wikipedia.org/wiki/Interstellar_cloud

Referenced by:
absorption line
bipolar outflow
blind survey
carbon (C)
Cassiopeia A
cloud fragmentation
Cloudy
carbon monoxide (CO)
conservation law
cooling function
Coriolis force
cosmic dust
C+
dark nebula
data cube
direct collapse black hole (DCBH)
dense core mass function (DCMF)
dense core
emission
emission coefficient (j)
emission line
energetic neutral atom (ENA)
evaporation
extinction
far infrared (FIR)
fluorescence
forbidden line
free-fall time
galaxy formation
galaxy merger
gravitational instability (GI)
giant molecular cloud (GMC)
gravitational collapse
gravity
molecular hydrogen dissociation front (H2 dissociation front)
HII region (HII)
HI region (HI)
high-velocity cloud (HVC)
hydrogen (H)
ice
ionization correction factor (ICF)
infrared dark cloud (IRDC)
kinematic distance
Lynds Catalog of Dark Nebulae (LDN)
light echo
line broadening
mass fraction
mass loading
molecular cloud turbulence
Messier Catalog (M)
metallicity (Z)
molecular cloud
nebula
nebular hypothesis
non-Gaussian (NG)
occultation
OH/IR source
1.3mm observation
Orion Nebula (M42)
PAWS
photodissociation
photoionization
polarimetry
polarization
position-position-velocity space (PPV)
reflection nebula
retrograde hot Jupiter
retrograde orbit
radiation hydrodynamics (RHD)
Rho Ophiuchi Cloud Complex
rotation curve
Serpens Cloud
star formation rate (SFR)
shock wave
signatures of formation
Smith Cloud
solar nebula
sound speed
spectral signature
starburst galaxy
star formation (SF)
stellar cluster
striae
Strömgren sphere
subgrid-scale physics
synchrotron radiation
synthetic spectrum
systemic velocity
Taurus-Auriga Complex
tidal disruption event (TDE)
thermodynamic equilibrium (TE)
three dimensional model
tidal arm
tidal force
timescale (t)
21cm line
TolTEC
tracer
Trapezium Cluster
turbulence
turbulent pressure
ultraluminous infrared galaxy (ULIRG)
vortex

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