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Hubble Updates NGC 2775 Portrait, Leaving Its Galaxy Type Up for Debate

The PHANGS-HST release adds H-alpha detail that clarifies recent star formation without settling the system’s mixed identity.

Overview

  • New imagery shows a smooth, gas-poor central region resembling an elliptical galaxy and a dusty, patchy outer ring characteristic of a spiral.
  • NASA says most astronomers would label NGC 2775 a flocculent spiral, though some researchers prefer a lenticular or hybrid classification.
  • The update incorporates narrowband red H-alpha observations that trace ionized hydrogen around massive young stars and refine views of star-forming regions.
  • Independent evidence points to a faint hydrogen tail nearly 100,000 light-years long, consistent with past interactions or mergers that could explain its distorted look.
  • Located about 67 million light-years away in Cancer, the galaxy’s single viewing angle limits a definitive classification, and further PHANGS-HST analysis is ongoing.