1. September 10, 1912: Arizona became the 48th state admitted to the United States. At that time, Phoenix was the capital of the new state.

2. September 10, 1962: The first successful launch of a spacecraft from NASA's Wallops Island launch facility occurred. Project Mercury's spacecraft Little Joe II was launched on a suborbital mission that collected data on re-entry dynamics and emergency abort procedures.

3. September 10, 2002: The Phoenix Comet was discovered by amateur astronomer Tony Phillips. The comet was visible in the Northern Hemisphere for several weeks and was one of the brightest comets visible from Earth that year.

4. September 10, 2007: The Phoenix Mars Lander took off aboard a Delta II rocket from Cape Canaveral, Florida. The lander was designed to study the Martian polar region and search for evidence of water and habitable conditions.

5. September 10, 2019: Arizona Senator John McCain was remembered and honored on the anniversary of his death. McCain, who served in the U.S. Congress for over 30 years, died on August 25, 2018, at the age of 81.