Apollo 15 Hammer-Feather Drop
Why the open web links it
Demonstrates Galileo's theory that all objects fall at the same rate in a vacuum on the Moon.
Linked by 15 independent sites, 5 of them widely read in the 2026-10 crawl of the open web, including nasa.gov, adevarul.ro, bigthink.com, libretexts.org, astronomy.com.