Outstanding problems and instrumental prospects for the coming decade (A Review)*†

AUTOR(ES)

Ostriker, Jeremiah P.

RESUMO

After a review of the discovery of external galaxies and the early classification of these enormous aggregates of stars into visually recognizable types, a new classification scheme is suggested based on a measurable physical quantity, the luminosity of the spheroidal component. It is argued that the new one-parameter scheme may correlate well both with existing descriptive labels and with underlying physical reality.

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