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The Viking 1 lander became the first spacecraft to successfully land on Mars and perform its mission.
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Viking 1
Robotic spacecraft sent to Mars
Viking 1 was the first of two spacecraft, along with Viking 2, each consisting of an orbiter and a lander, sent to Mars as part of NASA's Viking program. The lander touched down on Mars on July 20, 1976, the first successful Mars lander in history. Viking 1 operated on Mars for…Source: Wikipedia (CC BY-SA)
Lander (spacecraft)
Type of spacecraft
A lander is a spacecraft that descends towards, then comes to rest on the surface of an astronomical body other than Earth. In contrast to an impact probe, which makes a hard landing that damages or destroys the probe upon reaching the surface, a lander makes a soft landing…Source: Wikipedia (CC BY-SA)
Mars
Fourth planet from the Sun
Mars is the fourth planet from the Sun. It is also known as the "Red Planet", because of its orange-red appearance. Mars is a desert-like rocky planet with a tenuous carbon dioxide atmosphere. At the average surface level the atmospheric pressure is a few thousandths of Earth's,…Source: Wikipedia (CC BY-SA)