Hubble study finds dwarf galaxies retain less oxygen than expected
NASA reports that observations of 37 nearby dwarf galaxies suggest they have lost much of the oxygen produced by their stars.
What the record says
A study of 37 nearby dwarf galaxies found less oxygen than simulations predicted, NASA reported November 2. The Galaxies Losing Oxygen via Winds project used archival Hubble observations alongside data from the retired Spitzer telescope and ground-based radio observatories. Researchers examined the galaxies’ stellar histories and the distribution of oxygen in stars, gas and dust. NASA says the findings suggest winds driven by massive stars and supernova explosions remove oxygen from small galaxies more effectively than current models predict. Oxygen helps researchers track how stars distribute heavier elements as galaxies evolve. Where most of that missing oxygen ended up remains unresolved. It could be in surrounding gas or have been expelled farther away. The team plans further observations to investigate.
Source details and supporting locations.
Practical next step
Read NASA’s research report for the methods, limitations and linked journal paper.
Limits and what is not established
The study does not locate all the missing oxygen. The proposed role of galactic winds is a scientific interpretation, and planned observations are not completed results.
Sources checked November 4, 2026. Later notices may change instructions or arrangements.