January 31 to February 8, 1971 - Apollo 14 - USA Lunar Manned Lander - 44,456 kg
Crew: Alan B. Shepard, Jr., Edgar D. Mitchell, Stuart A. Roosa.
Shepard and Mitchell landed on the moon on February 5, 1971, in the Fra Mauro highlands, located at 3°40' S and longitude 17°28' E. They collected 42.9 kilograms of lunar samples and used a hand-held cart to transport rocks and equipment.

May 8, 1971 - Mariner 8 - USA Mars Flyby
Failed to reach Earth orbit.

May 10, 1971 - Kosmos 419 - USSR Mars Probe
Failed to leave Earth orbit.

May 19, 1971 - Mars 2 - USSR Mars Orbiter/Soft Lander - 4,650 kg
The Mars 2 lander was released from the orbiter on November 27, 1971. It crashed-landed because its breaking rockets failed - no data was returned and the first human artifact was created on Mars. The orbiter returned data until 1972.

May 28, 1971 - Mars 3 - USSR Mars Orbiter/Soft Lander - 4,643 kg
Mars 3 arrived at Mars on December 2, 1971. The lander was released and became the first successful landing on Mars. It failed after relaying 20 seconds of video data to the orbiter. The Mars 3 orbiter returned data until August, 1972. It made measurements of surface temperature and atmospheric composition.

May 30, 1971 - 1972 - Mariner 9 - USA Mars Orbiter - 974 kg
Mariner 9 arrived at Mars on November 3, 1971 and was placed into orbit on November 24. This was the first US spacecraft to enter an orbit around a planet other than the Moon. At the time of its arrival a huge dust storm was in progress on the planet. Many of the scientific experiments were delayed until the storm had subsided. The first hi-resolution images of the moons Phobos and Deimos were taken. River and channel like features were discovered. Mariner 9 is still in Martian orbit.

July 26 to August 7, 1971 - Apollo 15 - USA Lunar Manned Lander - 46,723 kg
Crew: David R. Scott, James B. Irwin, Alfred M. Worden.
Scott and Irwin landed on the moon on July 30, 1971. The landing site was Hadley-Apennine at latitude 26°6' N and longitude 3°39' E. They collected samples amounting to 76.8 kilograms. A lunar Roving Vehicle was carried on this mission (and all subsequent ones) which allowed the astronauts to travel several kilometers from the landing site. The commander service module was the first to carry orbital sensors and to release a subsatellite into lunar orbit. Worden performed the first deep spacewalk to retrieve film from the service module.

September 2, 1971 - 1972 - Luna 18 - USSR Lunar Lander - 5,600 kg
Unsuccessful sample return attempt. Crashed during landing.

September 28, 1971 - 1972 - Luna 19 - USSR Lunar Orbiter - 5,600 kg
The orbiter is now in a lunar orbit.

February 14, 1972 - Luna 20 - USSR Lunar Lander - 5,600 kg
Landed on the moon and returned samples to the Earth. Landed on February 21, 1972 at Apollonius highlands located at latitude 3°32' N and longitude 56°33' E. 30 grams of lunar samples were returned to the Earth.

March 3, 1972 - Pioneer 10 - USA Jupiter Flyby - 259 kg
Pioneer 10 flew by Jupiter on December 1, 1973. It passed 132,250 kilometers from Jupiter's cloud tops. It returned over 500 images of Jupiter and its moons. Pioneer 10's greatest achievement was the data collected on Jupiter's magnetic field, trapped charged particles, and solar wind interactions. The orbit boundary of Pluto was crossed on June 13, 1983. It has now left the solar system.

March 27, 1972 - Venera 8 - USSR Venus Lander - 1,180 kg
Venera 8 arrived at Venus on July 22, 1972. It measure wind speed variations as it descended through the atmosphere: 100 meters/second above 48 kilometers, 40-47 meters/second at 42-48 kilometers, and 1 meter/second below 10 kilometers. It returned data for 50 minutes after it landed.

April 16-27, 1972 - Apollo 16 - USA Manned Lunar Lander - 46,733 kg
Crew: John W. Young, Charles M. Duke, Jr., Thomas K. Mattingly II.
Young and Duke landed on April 21, 1972, at the Descartes crater located at latitude 9°00' N and longitude 15°31' E. They deployed instruments, drove the lunar rover, and collected 94.7 kilograms of samples during a 71-hour surface stay.

December 7-19, 1972 - Apollo 17 - USA Manned Lunar Lander - 46,743 kg
Crew: Eugene A. Cernan, Harrison H. Schmitt, and Ronald B. Evans.
Cernan and Schmitt landed on the moon on December 12, 1972. The landing site was Taurus-Littrow at latitude 20°10' N and longitude 30°46' E. They returned 110.5 kg of rock and soil samples. The astronauts covered 30.5 kilometers in the lunar rover during a 75-hour stay.

January 8, 1973 - Luna 21 - USSR Lunar Lander and Rover - 4,850 kg
Made lunar landing with an automated Lunokhod 2 rover.

April 6, 1973 - November 1995 - Pioneer 11 - USA Jupiter/Saturn Flyby - 259 kg
Pioneer 11 flew by Jupiter on December 1, 1974 passing 42,900 kilometers from Jupiter's cloud tops. It took better pictures than Pioneer 10, and measured Jupiter's intense charged-particle and magnet field environment. As it flew by Jupiter it was given a gravity assist which swung it onto a course for Saturn. On September 1, 1979, Pioneer 11 flew past the outer edge of Saturn's A ring at a range of 3,500 kilometers. It traveled underneath the ring system and passed 20,930 kilometers from Saturn's cloud tops. It has now left the solar system.

May 26, 1973 - Skylab - USA Space Station
Skylab, which was America's first space station, was manned for 171 days by three crews during 1973 and 1974. The space station included the Apollo Telescope Mount (ATM), which astronauts used to take more than 150,000 images of the Sun. Skylab was abandoned in February 1974 and re-entered the Earth's atmosphere in 1979.

June 10, 1973 - Explorer 49 - USA Solar Probe - 328 kg
Solar physics probe placed in lunar orbit.

July 21, 1973 - Mars 4 - USSR Mars Orbiter - 4,650 kg
Mars 4 arrived at Mars on February, 1974, but failed to go into orbit due to a malfunction of its breaking engine. It flew past the planet with in 2,200 kilometers of the surface. It returned some images and data.

July 25, 1973 - Mars 5 - USSR Mars Orbiter - 4,650 kg
Mars 5 entered into orbit around Mars on February 12, 1974. It acquired imaging data for the Mars 6 and 7 missions.

August 5, 1973 - Mars 6 - USSR Mars Orbiter/Soft Lander - 4,650 kg
On March 12, 1974, Mars 6 entered into orbit and launched its lander. The lander returned atmospheric descent data, but failed on its way down.

August 9, 1973 - Mars 7 - USSR Mars Orbiter/Soft Lander - 4,650 kg
On March 6, 1974, Mars 7 failed to go into orbit about Mars and the lander missed the planet. Carrier and lander are now in a solar orbit.

November 3, 1973 - March 24, 1975 - Mariner 10 - USA Mercury/Venus Flyby - 526 kg
Mariner 10 was the first dual planet mission. It flew past Venus on February 5, 1974 for a gravity assist to the planet Mercury. Mariner 10 was the first spacecraft to have an imaging system. It recorded circulation in the Venusian atmosphere and showed the temperature of the cloud tops to be -23°C. Mariner 10 flew past Mercury 3 times on March 29, 1974, September 21, 1974, and March 16, 1975. These three encounters produced over 10,000 pictures with 57% planet coverage. It recorded surface temperatures ranging from 187°C to -183°C on the day and night sides. A weak magnetic field was detected but it failed to detect an atmosphere. Mariner 10 is now in a solar orbit.

May 29, 1974 - 1975 - Luna 22 - USSR Lunar Orbiter - 5,600 kg
Successfully entered lunar orbit.

October 28, 1974 - Luna 23 - USSR Lunar Probe - 5,6000 kg
Crashed on the lunar surface.

December 10, 1974 - 1975 - Helios 1 - USA & West Germany Solar Probe - 370 kg
Solar probe is in a solar orbit; came within 47 million kilometers of the Sun.

June 8, 1975 - Venera 9 - USSR Venus Orbiter and Lander - 4,936 kg
Venera 9 arrived at Venus on October 22, 1975, three days before its sister spacecraft Venera 10. Both orbiters photographed the clouds and looked at the upper atmosphere. Differences in cloud layers were discovered at 57-70 kilometers, 52-57 kilometers, and 49-52 kilometers from the surface. The lander arrived on the Venusian surface on November 22, 1975. During a period of 53 minutes, it transmitted the first black and white images of the planets surface. It showed sharp-edged flat rocks and a basaltic terrain. The probe in now in a Venus orbit.

June 14, 1975 - Venera 10 - USSR Venus Orbiter and Lander - 5,033 kg
Venera 10 arrived at Venus on October 25, 1975, three days after its sister spacecraft Venera 9. Both orbiters photographed the clouds and looked at the upper atmosphere. Differences in cloud layers were discovered at 57-70 kilometers, 52-57 kilometers, and 49-52 kilometers from the surface. The lander arrived on the Venusian surface on November 25, 1975. During a period of 65 minutes, it transmitted black and white images of the planets surface. The terrain was more eroded than at the Venera 9 landing site.

August 20, 1975 - August 7, 1980 - Viking 1 - USA Mars Orbiter/Lander - 3,399 kg
Viking 1 and 2 were designed after the Mariner spacecraft. They consisted of an orbiter and lander. The orbiter weighed 900 kg and the lander 600 kg. Viking 1 went into orbit about Mars on June 19, 1976. The lander touched down on July 20, 1976 on the western slopes of Chryse Planitia. Both landers had experiments to search for Martian micro-organism. The results of these experiments are still being debated. The landers provided detailed color panoramic views of the Martian terrain. They also monitored the Martian weather. The orbiters mapped the planet's surface, acquiring over 52,000 images. Viking 1 orbiter was deactivate on August 7, 1980 when it ran out of altitude-control propellant. Viking 1 lander was accidentally shut down on November 13, 1982, and communication was never regained.

September 9, 1975 - July 25, 1978 - Viking 2 - USA Mars Orbiter/Lander - 3,399 kg
Viking 1 and 2 were designed after the Mariner spacecraft. They consisted of an orbiter and lander. The orbiter weighed 900 kg and the lander 600 kg. Viking 2 went into orbit about Mars on July 24, 1976. The lander touched down on August 7, 1976 at Utopia Planitia. Both landers had experiments to search for Martian micro-organism. The results of these experiments are still being debated. The landers provided detailed color panoramic views of the Martian terrain. They also monitored the Martian weather. The orbiters mapped the planet's surface, acquiring over 52,000 images. Viking 2 orbiter was deactivate on July 25, 1978 when it ran out of altitude-control propellant. Viking 2 lander used Viking 1 orbiter as a communications relay, and had to be shut down at the same time as the orbiter on August 7, 1980.