Story one of ten today, about five minutes for the lot
✓ 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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