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)
Further reading:
http://en.wikipedia.org/wiki/Interstellar_cloud

Referenced by pages:
absorption line
astronomical object
broad emission line region
bipolar outflow
blind survey
broad-line region (BLR)
Boltzmann Transport Equation (BTE)
carbon (C)
Cassiopeia A
cloud fragmentation
Cloudy
Compton reflection
conservation law
cooling function
Coriolis force
cosmic dust
C+
dark galaxy
dark nebula
data cube
direct collapse black hole (DCBH)
dense core mass function (DCMF)
dense core
velocity dispersion (σ)
evaporating gas globule (EGG)
emission
emission coefficient (j)
emission line
energetic neutral atom (ENA)
evaporation
extended source
extinction
far infrared (FIR)
fluorescence
forbidden line
free-fall time
galactic bulge
galactic disk
galaxy formation
galaxy merger
gravitational instability (GI)
giant molecular cloud (GMC)
gravitational collapse
gravity
molecular hydrogen dissociation front (H2 dissociation front)
Hydrogen Accretion in Local Galaxies Survey (HALOGAS)
HII region (HII)
HI region (HI)
high-velocity cloud (HVC)
hydrogen (H)
ice
ionization correction factor (ICF)
ionizing radiation
infrared dark cloud (IRDC)
iron (Fe)
kinematic distance
Lynds Catalog of Dark Nebulae (LDN)
Local Interstellar Cloud (LIC)
light echo
line broadening
Local Bubble
Lyman-Werner photon
mass fraction
mass loading
molecular cloud turbulence
Messier Catalog (M)
metal
metallicity (Z)
molecular cloud
nebula
nebular hypothesis
non-Gaussian (NG)
occultation
OH/IR source
1.3-mm observation
Orion Nebula (M42)
PAWS
photodissociation
photoionization
plasma astrophysics
polarimetry
polarization
plane of the sky (POS)
position-position-velocity space (PPV)
pulsar wind nebula (PWN)
rare designator prefixes
reflection nebula
retrograde hot Jupiter
retrograde orbit
radiation hydrodynamics (RHD)
Rho Ophiuchi Cloud Complex
rotation curve
self-absorption
Serpens Cloud
star formation rate (SFR)
shock wave
signatures of formation
Smith Cloud
solar nebula
sound speed
spectral signature
synchrotron self-Compton (SSC)
starburst galaxy
star formation (SF)
stellar cluster (SC)
striae
Strömgren sphere
subgrid-scale physics
supershell
synchrotron radiation
synthetic spectrum
systemic velocity
Taurus-Auriga Complex
tidal disruption event (TDE)
Thermal Bremsstrahlung
thermodynamic equilibrium (TE)
three dimensional model
tidal arm
tidal force
timescale (t)
21-cm line
TolTEC
tracer
Trapezium Cluster
turbulence
turbulent pressure
ultraluminous infrared galaxy (ULIRG)
vortex
W51

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