On Oct. 25, 1671, the Italian astronomer Giovanni Cassini discovered a new moon at Saturn! Here's why it mattered.
Back to Science
Science
October 25, 2026 at 1:17 PM
On this day in space! Oct. 25, 1671: Astronomer Giovanni Cassini discovers Iapetus, Saturn's 'yin-yang' moon
Space.com
Excerpt from Space.com.