On this day: September 25
NASA Launches Mars Observer Mission
On September 25, 1992, NASA launched the Mars Observer spacecraft to study the Martian surface, atmosphere and magnetic field in preparation for extended exploration—though the spacecraft later failed before completing primary science operations.
China Expands Enforcement of One-Child Policy
On September 25, 1980, Chinese authorities announced measures to expand enforcement of the nationwide one-child policy, tightening family planning controls amid demographic and economic concerns.
Supreme Court Rules School Prayer Unconstitutional in 1962 Decision
On September 25, 1962, the U.S. Supreme Court held that official school-sponsored prayer in public schools violated the First Amendment’s Establishment Clause, a landmark ruling that reshaped church–state relations in American public education.