Mark Edward Kelly (born February 21, 1964) is an American politician, businessman, retired astronaut for NASA, and retired U.S. Navy captain serving as the junior United States senator from Arizona since 2020. A member of the Democratic Party, he won the 2020 special election, defeating incumbent Republican Martha McSally. 
Kelly flew combat missions during the Gulf War as a naval aviator before being selected as a NASA Space Shuttle pilot in 1996. He flew his first space mission in 2001 as pilot of STS-108, piloted STS-121 in 2006, and commanded STS-124 in 2008 and STS-134 in 2011, the final mission of Space Shuttle Endeavour. His identical twin Scott Kelly is also a retired astronaut; they are the only siblings to have both traveled in space.Kelly's wife, then-Arizona Congresswoman Gabby Giffords, was shot and nearly killed in an assassination attempt on January 8, 2011. Six people died in the Tucson shooting. After the Sandy Hook Elementary School shooting the following year, Giffords and Kelly founded the nonprofit Americans for Responsible Solutions, later renamed Giffords, which campaigns for gun control measures like universal background checks and red flag laws. Kelly won the 2020 United States Senate special election in Arizona and was sworn in on December 2, 2020.


== Early life and education ==
Mark Edward Kelly and twin brother Scott Kelly are the sons of Richard and Patricia (née McAvoy) Kelly, two retired police officers. He is of Irish descent. He was born on February 21, 1964, in Orange, New Jersey, and raised in West Orange, New Jersey. Kelly graduated from Mountain High School in 1982. He received a Bachelor of Science in marine engineering and nautical science from the United States Merchant Marine Academy, graduating with highest honors in 1986. In 1994, he received a Master of Science in aeronautical engineering from the U.S. Naval Postgraduate School.


== Naval career ==
In December 1987, Kelly became a naval aviator and received initial training on the A-6E Intruder attack aircraft. He was then assigned to Attack Squadron 115 (VA-115) in Atsugi, Japan, and made two deployments to the Persian Gulf on the aircraft carrier USS Midway, flying 39 combat missions in Operation Desert Storm. After receiving his master's degree, Kelly attended the U.S. Naval Test Pilot School from 1993 to 1994. He has logged more than 5,000 hours in more than 50 different aircraft and has over 375 carrier landings.Kelly has received two Defense Superior Service Medals; one Legion of Merit; two Distinguished Flying Crosses; four Air Medals (two individual/two strike flight) with Combat "V"; two Navy Commendation Medals, (one with combat "V"); one Navy Achievement Medal; two Southwest Asia Service Medals; one Navy Expeditionary Medal; two Sea Service Deployment Ribbons; a NASA Distinguished Service Medal; and an Overseas Service Ribbon.On June 21, 2011, Kelly announced his retirement from the U.S. Navy and NASA, effective October 1, 2011. His retirement was announced on his Facebook page, where he wrote, "Words cannot convey my deep gratitude for the opportunities I have been given to serve our great nation. From the day I entered the United States Merchant Marine Academy in the summer of 1982 to the moment I landed the Space Shuttle Endeavour three weeks ago, it has been my privilege to advance the ideals that define the United States of America."


== NASA career ==

NASA selected both Mark and Scott Kelly to be Space Shuttle pilots in 1996. They joined the NASA Astronaut Corps in August of that year. Mark Kelly has logged over 54 days in space. During his 2006 flight on Space Shuttle Discovery, the second mission after the loss of Space Shuttle Columbia, Kelly discussed the risks of flying the Space Shuttle:

The Space Shuttle's a very complex machine. It's got a lot of moving parts that move and operate at pretty much the limit of what we've been able to engineer. Spaceflight is risky. I think with regards to the tank, we've reduced some of the risk there. We've changed the design a little bit and we've made some pretty big strides in trying to get foam not to shed from the tank anymore. So there is some risk reduction there and I guess overall the risk is probably a little less. But this is a risky business, but it's got a big reward. Everybody on board Discovery and the space station here thinks it's worthwhile.


=== Spaceflight experience ===


==== STS-108 ====

Kelly's first trip into space was as pilot of STS-108. After several delays, Endeavour lifted off on December 5, 2001, on the final Shuttle mission of 2001.STS-108 Endeavour visited the ISS, delivering over three tons of equipment, supplies, and a fresh crew to the orbiting outpost. The hatches were opened between Endeavour and the ISS Destiny Laboratory on December 7, enabling the 10 crew members to greet one another. The Expedition 3 crew officially ended their 117-day residency on board the ISS on December 8 as their custom Soyuz seat-liner