Ghost Streams Over Our Heads: How Gaia's Stellar Tides Map Dark Matter
Gaia has found 100+ stellar streams crisscrossing the Milky Way halo. Each gap, spur, and kink is a dark-matter subhalo's fingerprint. Here's how astronomers read them.
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The Dark Energy Survey Just Mapped the Cosmic Web — Here's What the Largest Structure in the Universe Actually Looks Like
Six years, 300 million galaxies, and the most precise map of dark matter ever made. The Dark Energy Survey's final results confirm the standard cosmological model — but also hint at tensions that could point to new physics.