A Trace of Lithium Turns One Dwarf Galaxy Into a Time Machine
A lithium survey of 209 Small Magellanic Cloud giants traces how stellar mixing and novae may shape a neighboring galaxy’s chemical history.
galaxy evolution
At Cosmic Dawn, Half of Galaxies Had Extreme Emission Lines
JWST imaging finds extreme oxygen-and-hydrogen emission in about half of galaxies at redshift 8.3, pointing to burstier early star formation.
The X-ray Halo That Could Reveal a Galaxy’s Hidden Past
A galaxy’s hot halo can glow brighter because it is metal-rich, not simply because it holds more gas—a clue and a challenge for tracing cosmic feedback.