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Why this Hubble galaxy has one lush spiral arm and one bare one
✓ NASAScience & Systems

NGC 4654's lopsided spiral arms trace two competing galactic forces

Two cosmic forces shaped NGC 4654: ram pressure from racing through intergalactic gas, and a near-miss with a neighbour 500 million years ago.

Why it mattersThe images help scientists understand what stops galaxies from forming stars, which could reveal the eventual fate of our own Milky Way.

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