4 January 2004, 04:35 Ground UTC: The NASA Mars Exploration Rover A, named Spirit, landed on the surface of Mars within the large impact crater Gusev. The location of touch down and the starting point for the rover’s exploration of Mars is named Columbia Memorial Station.
3 December 1973: At 02:26:00 UTC, the NASA interplanetary probe Pioneer 10 reached its closest approach to the gas giant, Jupiter, 132,252 kilometers (82,178 miles) above the planet’s cloud tops. At that time, Pioneer 10 had a velocity of approximately 132,000 kilometers per hour (82,021 miles per hour).
During the encounter with Jupiter, more than 500 photographic images were made and transmitted to Earth. A variety of measurements were made by sensors aboard the space craft.
Pioneer 10 was built by the TRW Space & Technology Group, Redondo Beach, California, for the NASA Ames Research Laboratory. It was launched by a three-stage Atlas Centaur rocket from Launch Complex 36A, Kennedy Space Center, Cape Canaveral, Florida, 2 March 1972.
The last signal received from Pioneer 10 was on 23 January 2003. At that time, the probe was an estimated 12 billion kilometers (80 Astronomical Units) from Earth.
22 October 1975, 05:13 UTC: The lander from the Soviet space probe Venera 9 touched down on the surface of the planet Venus, at approximately 32° south latitude, 291° east longitude.
The images and other data was transmitted to an orbiting section of Venera 9 for relay to Earth. The lander sent signals for approximately 53 minutes before the orbiter traveled out of range.
Venera 9 had been launched from the Baikonur Cosmodrome aboard a Proton-K rocket, 8 June 1975. The space probe weighed 4,936 kilograms (10,882 pounds).
Once in orbit around Venus, the spacecraft separated into the orbiter and lander. As the lander descended to the surface, data was collected about the planet’s atmosphere. A 40-kilometer (25-mile) deep layer of clouds was studied. The cloud bases were about 35–40 kilometers (22–25 miles) above the surface. The clouds contained hydrochloric and hydrofluoric acid, bromine and iodine.
At the planet’s surface the atmospheric pressure was 90 times that of Earth’s. The temperature was measured at 485 °C. (905 °F.).
“This picture of the Earth and Moon in a single frame, the first of its kind ever taken by a spacecraft, was recorded September 18, 1977, by NASA’s Voyager 1 when it was 7.25 million miles (11.66 million kilometers) from Earth. The moon is at the top of the picture and beyond the Earth as viewed by Voyager. In the picture are eastern Asia, the western Pacific Ocean and part of the Arctic. Voyager 1 was directly above Mt. Everest (on the night side of the planet at 25 degrees north latitude) when the picture was taken. The photo was made from three images taken through color filters, then processed by the Image Processing Lab at Jet Propulsion Laboratory (JPL). Because the Earth is many times brighter than the Moon, the Moon was artificially brightened by a factor of three relative to the Earth by computer enhancement so that both bodies would show clearly in the prints. Voyager 1 was launched September 5, 1977 and Voyager 2 on August 20, 1977. JPL is responsible for the Voyager mission.”—NASA Greatest Images Archive