Last Updated: February 19, 2026
Ellipticals: Red, Dead, or Just Done Throwing Parties?
Monster ellipticals host mostly older stars, hotter X-ray halos, and histories of mergers—quiet streets until you notice the billion-degree weather overhead.
Open guide ->
Last Updated: January 20, 2026
Our Milky Way: A Barred Galaxy You Can Actually Hike Under
Gaia and friends keep drafting a dynamic map of streams, thick disks, and accreted fossils—we are inside the specimen, which is inconvenient and thrilling.
Open guide ->
Last Updated: June 10, 2023
Galaxy Collisions: Stellar Near Misses at Cosmic Speeds
Galaxies mostly pass through empty space, yet tidal tails rip long bridges of stars while gas clouds slam and spawn starburst fireworks.
Open guide ->
Last Updated: April 26, 2022
Spiral Arms: Traffic Jams Made of Stars and Gas
Arms are not fixed strings of glitter; density waves compress gas, ignite stars, and paint lighthouses along gently persistent traffic patterns.
Open guide ->