By Will Dunham

(Reuters) – John Glenn, who became one of the 20th century’s greatest explorers as the first American to orbit Earth and later as the world’s oldest astronaut, and also had a long career as a U.S. senator, died in Ohio on Thursday at age 95.

Glenn, the last surviving member of the original seven American “Right Stuff” Mercury astronauts, died at the James Cancer Hospital at Ohio State University in Columbus, said Hank Wilson, a spokesman at the university’s John Glenn College of Public Affairs, which Glenn helped found.

Glenn was credited with reviving U.S. pride after the Soviet Union’s early domination of manned space exploration. His three laps around the world in the Friendship 7 capsule on Feb. 20, 1962, forged a powerful link between the former fighter pilot and the Kennedy-era quest to explore outer space as a “New Frontier.”

President Barack Obama, who in 2012 awarded Glenn the nation’s highest civilian honor, the Presidential Medal of Freedom, said: “With John’s passing, our nation has lost an icon.”

U.S. President Barack Obama awards a 2012 Presidential Medal of Freedom to astronaut and former U.S. Senator John Glenn during a ceremony in the East Room of the White House in Washington, May 29, 2012. REUTERS/Jason Reed

“When John Glenn blasted off from Cape Canaveral atop an Atlas rocket in 1962, he lifted the hopes of a nation,” Obama said in a statement. “And when his Friendship 7 spacecraft splashed down a few hours later, the first American to orbit the Earth reminded us that with courage and a spirit of discovery there’s no limit to the heights we can reach together.”

President-elect Donald Trump said on Twitter the United States had lost “a great pioneer of air and space in John Glenn. He was a hero and inspired generations of future explorers.”

As the third of seven astronauts in NASA’s solo-flight Mercury program to venture into space, Glenn became more of a media fixture than the others and was known for his composure and willingness to promote the program.

Glenn’s astronaut career, as well as his record as a fighter pilot in World War Two and the Korean War, helped propel him to the U.S. Senate in 1974, where he represented his home state of Ohio for 24 years as a moderate Democrat.

His star was dimmed somewhat by a Senate investigation of several senators on whether special favors were done for a major campaign contributor. He was cleared of wrongdoing.

Glenn’s entry into history came in early 1962 when fellow astronaut Scott Carpenter bade him “Godspeed, John Glenn” just before the Ohio native was rocketed into space for a record-breaking trip that would last just under five hours.

Astronaut John H. Glenn, Jr., is pictured during the Mercury-Atlas 6 spaceflight becoming the first American to orbit Earth, February 20, 1962, in this handout photo taken by a camera onboard the spacecraft, provided by NASA. REUTERS/NASA/Handout

‘VIEW IS TREMENDOUS’

“Zero-G (gravity) and I feel fine,” was Glenn’s succinct assessment of weightlessness several minutes into his mission. “Oh, and that view is tremendous.”

After splashdown and recovery in the Atlantic, Glenn was treated as a hero, addressing a joint session of Congress and feted in a New York ticker-tape parade.

Glenn had been hospitalized since Nov. 25. He “died peacefully,” according to a statement from his family and Ohio State University. “He left this earth for the third time as a happy and fulfilled person,” the statement said.

“Glenn’s extraordinary courage, intellect, patriotism and humanity were the hallmarks of a life of greatness. His missions have helped make possible everything our space program has since achieved and the human missions to an asteroid and Mars that we are striving toward now,” NASA Administrator Charles Bolden said.

Glenn’s experiences as a pioneer astronaut were chronicled in the book and movie “The Right Stuff,” along with the other Mercury pilots. The book’s author, Tom Wolfe, called Glenn “the last true national hero America has ever had.”

“I don’t think of myself that way,” Glenn told the New York Times in 2012 to mark the 50th anniversary of his flight. “I get up each day and have the same problems others have at my age. As far as trying to analyze all the attention I received, I will leave that to others.”

Glenn’s historic flight made him a favorite of President John F. Kennedy and his brother Robert, who encouraged him to launch a political career that finally took off after a period as a businessman made him a millionaire.

HERO STATUS

Even before his Mercury flight, Glenn qualified for hero status, earning six Distinguished Flying Crosses and flying more than 150 missions in World War Two and the Korean War.

After Korea, Glenn became a test pilot, setting a transcontinental speed record from Los Angeles to New York in 1957.

The determination and single-mindedness that marked Glenn’s military and space career did not save him from misjudgments and defeat in politics. He lost his first bid for the Senate from Ohio in 1970, after abandoning a race in 1964 because of a head injury suffered in a fall.

He was elected in 1974 and was briefly considered as a running mate for Democratic presidential candidate Jimmy Carter in 1980. But a ponderous address at the Democratic National Convention – people walked out – caused Carter to remark that Glenn was “the most boring man I ever met.”

Glenn sought the Democratic presidential nomination himself in 1984 but was quickly eliminated by eventual nominee Walter Mondale, Carter’s vice president. His failure was all the more stinging because he had been touted as an early front-runner.

In the Senate, Glenn was respected as a thoughtful moderate with expertise in defense and foreign policy. His luster was dulled, however, by a Senate investigation of the “Keating Five” – five senators suspected of doing favors for campaign contributor Charles Keating Jr. The panel eventually found Glenn did nothing improper or illegal.

BACK TO SPACE

He took a leading role in seeking to prevent the spread of nuclear weapons, especially to Pakistan. He was the author of a law that forced the United States to impose sanctions on India and Pakistan in 1998 after both countries conducted nuclear tests.

He also was a staunch advocate of a strong military and took a keen interest in strategic issues. He retired from the Senate in 1999.

Thirty-six years after his maiden space voyage, Glenn became America’s first geriatric astronaut on Oct. 29, 1998. He was 77 when he blasted off as a mission specialist aboard the shuttle Discovery. He saw it as a blow to the stereotyping of the elderly.

STS-95 crewmember, astronaut and U.S. Senator John Glenn poses for his official NASA photo taken April 14, 1998. Courtesy NASA/Handout via REUTERS

“Maybe prior to this flight, we were looked at as old geezers who ought to get out of the way,” Glenn said after his nine-day shuttle mission. “Just because you’re up in years some doesn’t mean you don’t have hopes and dreams and aspirations just as much as younger people do.”

John Herschel Glenn Jr. was born on July 18, 1921, in Cambridge, Ohio.

In his latter years, he was an adjunct professor at the John Glenn College of Public Affairs.

He had a knee replacement operation in 2011 and heart surgery in 2014.

Glenn is survived by his wife of 73 years, his childhood sweetheart, Annie Castor. They had two children, David and Lyn.

(Reporting by Will Dunham in Washington; Additional reporting by Irene Klotz in Cape Canaveral, Fla., and Ben Klayman in Detroit; Editing by Bill Trott and Peter Cooney)