John Glenn, a former astronaut and longtime U.S. senator, died on Thursday, Dec. 8, 2016. He was 95.

Glenn was the first American to orbit Earth and the last surviving member of the original seven "Right Stuff" Mercury astronauts.

Glenn's entry into history came in early 1961 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.

"John Glenn is, and always will be, Ohio's ultimate hometown hero, and his passing today is an occasion for all of us to grieve," Ohio Gov. John Kasich said Thursday in a statement posted to Twitter.

Scroll down to see how politicians, members of the science community, celebrities and more notables are reacting to Glenn's death.

John Herschel Glenn Jr. was born on July 18, 1921, in Cambridge, Ohio. He married childhood sweetheart, Annie Castor, and they had two children, David and Lyn.