Every Cosmic Herald story on Space Telescope Science Institute — missions, launches, discoveries, and the business of space, newest first.
Four stacked JWST/MIRI eclipses of the super-Earth GJ 3929 b rule out thick CO2 or water atmospheres at high confidence, giving the Rocky Worlds program its first finished case file — and a warm, dark rock instead of a habitable world.
Read the story →Astronomers used Hubble to catch ionizing UV light escaping a small, furiously star-forming galaxy in the reionization epoch — the first such detection, and direct evidence for how the early universe became transparent.
Webb found unexpected dust-making in Sextans A, a chemically primitive dwarf galaxy — evidence that the earliest galaxies could forge solid grains by pathways unlike those that dominate today.
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