July 23, 1999: Chandra X-Ray Observatory launches

On July 23, 1999, the Chandra X-Ray Observatory launched aboard the Space Shuttle Columbia; it would see first light a few weeks later, on Aug. 26. With resolution eight times greater than any previous scope, Chandra is the most powerful X-ray telescope ever built. The observatory is intended to help […]

Crews Move Artemis IV Liquid Hydrogen Tank

Crews at NASA’s Michoud Assembly Facility in New Orleans transport the 130-foot-tall Artemis IV liquid hydrogen tank out of a production cell inside the main factory building into a detached test building on a separate portion of the 829-acre site on May 15, 2026. The liquid hydrogen tank will form part […]

A study of 11,989 Polymarket users finds 61% placed fewer than 100 trades over a six-week period, with 58% making or losing less than $100 during that period (Kaitlyn Radde/Pew Research Center)

Kaitlyn Radde / Pew Research Center: A study of 11,989 Polymarket users finds 61% placed fewer than 100 trades over a six-week period, with 58% making or losing less than $100 during that period  —  Prediction markets are an increasingly popular way for people to trade on the outcomes of […]