cosmic structure class · galactic

Galaxies

Galaxies give structure to visible cosmic matter, but their shape labels are descriptive tools rather than complete histories.

Scale

from hundreds of light-years to over a million light-years across

Structure

gravitationally bound systems of stars, planets, gas and dust

Formation / process

galaxies evolve through star formation, interactions, mergers and internal processes

Observation

integrated light, spectra, resolved stars where possible, multiwavelength surveys

Representation

classification schemes simplify a wider continuum of shapes

Evidence state

Verified / sourced

Core factual statements below are linked to reviewed NASA sources. Descriptive framing is ICU editorial synthesis.

Sourced facts

NASA describes galaxies as gravitationally bound systems of stars, planets, gas and dust.
Common broad forms include spirals, ellipticals and irregulars.

Source register

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