April 17th, 1970 the capsule from the Apollo 13 mission splashed down in the Pacific Ocean, and the whole world breathed a sigh of relief.

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Apollo 13 launched from Cape Canaveral on April 11, intended to be the third manned lunar landing. The crew — James A. Lovell Jr., John L. Swigert Jr. and Fred W. Haise Jr. — experienced a slight vibration shortly after launch, but things were going normally until 55 hours, 55 minutes into the flight.

Oxygen tank No. 2 exploded, causing No. 1 to fail and start leaking rapidly. Warning lights started blinking. The astronaut’s supplies of air, water, light and electricity were imperiled … 200,000 miles from Earth.

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On April 14, 1865, John Wilkes Booth, an actor and Confederate sympathizer, fatally shoots President Abraham Lincoln at a play at Ford’s Theater in Washington, D.C. The attack came only five days after Confederate General Robert E. Lee surrendered his massive army at Appomattox Court House, Virginia, effectively ending the American Civil War.

Booth, a Maryland native born in 1838, who remained in the North during the war despite his Confederate sympathies, initially plotted to capture President Lincoln and take him to Richmond, the Confederate capital. However, on March 20, 1865, the day of the planned kidnapping, the president failed to appear at the spot where Booth and his six fellow conspirators lay in wait. Two weeks later, Richmond fell to Union forces. In April, with Confederate armies near collapse across the South, Booth hatched a desperate plan to save the Confederacy.

Learning that Lincoln was to attend a performance of “Our American Cousin” at Ford’s Theater on April 14, Booth masterminded the simultaneous assassination of Lincoln, Vice President Andrew Johnson and Secretary of State William H. Seward. By murdering the president and two of his possible successors, Booth and his conspirators hoped to throw the U.S. government into disarray.

On the evening of April 14, 1865, conspirator Lewis T. Powell burst into Secretary of State Seward’s home, seriously wounding him and three others, while George A. Atzerodt, assigned to Vice President Johnson, lost his nerve and fled. Meanwhile, just after 10 p.m., Booth entered Lincoln’s private theater box unnoticed and shot the president with a single bullet in the back of his head. Slashing an army officer who rushed at him, Booth leapt to the stage and shouted “Sic semper tyrannis! [Thus always to tyrants]–the South is avenged!” Although Booth broke his leg jumping from Lincoln’s box, he managed to escape Washington on horseback.

The president, mortally wounded, was carried to a lodging house opposite Ford’s Theater. About 7:22 a.m. the next morning, Lincoln, age 56, died–the first U.S. president to be assassinated. Booth, pursued by the army and other secret forces, was finally cornered in a barn near Bowling Green, Virginia, and died from a possibly self-inflicted bullet wound as the barn was burned to the ground. Of the eight other people eventually charged with the conspiracy, four were hanged and four were jailed.

On April 8, 1959, NASA announced The Mercury Seven: the seven men to make up their first astronaut class.

The Mercury Seven were chosen in Washington, DC from a body of 69 candidates. The name comes from Mercury, a Roman mythological god who is seen as a symbol of speed. Because of the small space inside the Mercury capsule, candidates could be no taller than 5 feet 11 inches and weigh no more than 180 pounds. The initial flights took off throughout the early 1960s, though some astronauts were active in later decades. Here are the guys:

Malcolm Scott Carpenter (1925 – 2013) was a US Navy piolot aviation cadet who flew missions during the Korean War. He was on board the MA-7 (Aurora 7) and was the first American astronaut to eat solid food in space. He successfully overcame an overexpenditure of fuel due to hardware problems on his one and only mission. Carpenter was forced to retire from spaceflight after sustaining a motorbike accident. After retiring from the Navy, he founded Sea Sciences Inc., a corporation for developing programs for utilizing ocean resources and improving environmental health.

Leroy Gordon (Gordo) Cooper Jr. (1927 – 2004) was very active in the Boy Scouts of America and achieved the second highest rank of Life Scout. Prior to joining NASA, Cooper also served in the US Air Force and Marine Corps. He was on board the MA-9 (Faith 7) and Gemini 5, and developed a personal survival knife for astronauts to carry. Cooper was the first American to sleep in orbit. Interestingly, he took photos of and reported UFO sightings to the Pentagon, but they swept the incident under the rug.

John Herschel Glenn Jr. (1921 – 2016) began his career as a US Marine Corps fighter pilot. He was on board the MA-6 (Friendship 7) and STS-95. Noticed for his heroics in space, Glenn became friendly with the Kennedys and a prominent public figure. After retiring from NASA, he ran as a Democrat and represented the state of Ohio in the United States Senate from 1974 to 1999.  Glenn returned to space on the Space Shuttle on October 29, 1998, as a Payload Specialist on Discovery‘s STS-95 mission, becoming, at age 77, the oldest person to go into space. According to The New York Times, Glenn “won his seat on the Shuttle flight by lobbying NASA for two years to fly as a human guinea pig for geriatric studies”, which were named as the main reasons for his participation in the mission.

Virgil Ivan (Gus) Grissom (1926 – 1967) was a US Air Force pilot before joining NASA. He was on board the MR-4 (Liberty Bell 7), Gemini 3, and Apollo 1. Grissom was tragically killed along with fellow astronauts Ed White and Roger Chaffee during a pre-launch test for the Apollo 1 mission. After death, his family was involved in a spacesuit controversy: NASA insisted Grissom got authorization to use his spacesuit for a show and tell at his son’s school and never returned it, but his family claimed the he had rescued the spacesuit from a scrap heap and that it rightfully belonged to them.

Walter Marty (Wally) Schirra Jr. (1923 – 2007)’s father was a pilot, and his mother performed wing walking stunts when he was on duty. Schirra served as an officer in the US Navy, and was later dispatched to South Korea as a pilot on loan to the US Air Force. On board the MA-8 (Sigma 7), Gemini 6A, and Apollo 7, he was the only person to fly in all of America’s first three space programs. Schirra gained notoriety for playing “Jingle Bells” on a harmonica he smuggled on board Gemini.

Alan Bartlett Shepard Jr. (1923 – 1998) began as a US Navy as test pilot. He was the first American in space, and flew on board the MR-3 (Freedom 7) and Apollo 14. It’s said that shortly before one launch, Shepard blurted out “Please, dear God, don’t let me fuck up.” This has since become known among aviators as “Shepard’s Prayer.” A successful businessman, Shepard was the first astronaut to become a millionaire while still in the program. His hometown of Derry, NH almost changed its name to “Spacetown” in honor of Schirra’s career.

Donald Kent (Deke) Slayton (1924 – 1993) was also a US Air Force pilot before joining NASA. He was grounded from space flight by a heart condition, but served as NASA’s Director of Flight Crew Operations. Slayton served as head of Astronaut selection. In 1972 he was granted medical clearance to fly as docking module pilot of the Apollo-Soyuz Test Project. At the time of the flight, he became the oldest person to fly into space.