1. apollo 1: three astronauts died in a fire
2. apollo 11: first successful manned landing on the moon
3. apollo 13: explosion on board nearly killed the crew
4. apollo 15: first use of lunar rover
Explanation:
• Apollo 1 was the first manned mission of the US space program known as the Apollo project, whose objective was to achieve a manned moon landing on the Moon. The planned orbital test in the ground orbit of the Apollo command and service module failed to meet the launch date scheduled for February 21, 1967, due to a fire in the cockpit during a test on the launch pad. 34 , which occurred on January 27 at the launch complex of the Cape Canaveral Air Force station, killing the three crew members.
• Apollo 11 was a manned space mission from the United States whose goal was to get a human being to walk on the surface of the Moon. The mission was sent to space on July 16, 1969, reached the surface of the Moon on July 20 of the same year and the next day managed to get two astronauts (Armstrong and Aldrin) to walk on the lunar surface.
• Apollo 13 was the seventh manned mission of the Apollo Program of the United States of America and the third with the aim of landing. The ship was launched on April 11, 1970 at 7:13 pm UTC (2:13 pm EST). The landing was aborted due to the explosion of an oxygen tank two days after takeoff, disabling the service module (SM), on which the control module (CM) depended. Due to the cited oxygen tank incident, the crew - assisted by the Lyndon B. Johnson Space Center - had to improvise a plan on the fly to be able to return, using the lunar module (LM) as an improvised "lifeboat".
• Apollo 15 was the ninth manned mission of the Apollo program (officially called AS-510), it was launched on July 26, 1971 by a Saturn 5 type rocket, in the direction of the Moon. It was the first of the type J missions, that is, with modifications in the spacecraft that allowed a flight duration of up to 14 days. Shortly after the lunar orbit number 12 began, the descent module landed on July 30 at 26.08º N 3.66º E (only a hundred meters from the theoretical point in the Hadley-Apennines region, on the Mare Imbrium) taking as crew members David R. Scott -comandante-, Alfred M. Worden and James B. Irwin.
