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12 Cards in this Set

  • Front
  • Back
what problem does ISM cause?
BLOCKS VIEWS
what is ISM?
INTERSTELLAR MEDIUM or INTERSTELLAR MASS
what are the two components of ISM?
GAS and DUST
the overall dimming of starlight by ISM
EXTINCTION
the reddened appearance of starlight passing through ISM
REDDENING
why reddening occurs
SCATTERING
common composition of ISM
HYDROGEN, HELIUM, SILICON, CARBON, etc.
glowing clouds of hot ISM
EMISSION NEBULAE
any "fuzzy" patch in the sky
NEBULA
bluish region causes by starlight scattering from dust clouds between viewer and emission nebula
REFLECTION NEBULA
spectral lines that don't match normal spectral lines
FORBIDDEN LINES
ISM much colder than their surroundings
DARK DUST CLOUDS