'Ghost towns' of the universe: Ultra-faint, rare dwarf galaxies offer clues to the early cosmos

Wednesday

Sculptor A, one of three newly discovered dwarf galaxies - and unrelated to the well-known Sculptor spiral galaxy - is visible here as a faint accumulation of stars beyond several bright stars in the foreground.

Astronomers have struggled with finding ultra-faint dwarf galaxies far enough from the Milky Way's influence, making these faintest galaxies in the cosmos difficult to study. Three newly discovered dwarf galaxies in an isolated region of space show evidence of star formation being cut short by events in the early universe.

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